This TWELFTH SUPPLEMENTAL INDENTURE, dated as of June 17, 2025 (the “Twelfth Supplemental Indenture”), is entered into by and among United States Cellular Corporation, a corporation duly organized and existing under the laws of the State of Delaware (the “Company”), and The Bank of New York Mellon Trust Company, N.A. (formerly known as The Bank of New York Trust Company, N.A., as successor to BNY Midwest Trust Company), a national banking association, as trustee (the “Trustee”).

WHEREAS, the Company and the Trustee are parties to an Indenture, dated as of June 1, 2002 (the “Base Indenture”), as supplemented by the Third Supplemental Indenture dated as of December 3, 2003 (the “Third Supplemental Indenture”) and the Fifth Supplemental Indenture dated as of June 21, 2004 (the “Fifth Supplemental Indenture” and together with the Base Indenture and the Third Supplemental Indenture, the “Indenture”) relating to the issuance of the Company’s 6.70% Senior Notes due 2033 (the “2033 Notes”) issued on December 8, 2003 and June 28, 2004, in the aggregate principal amount of $544,000,000;

WHEREAS, the Company desires to amend certain provisions of the Indenture, as set forth in Article Two of this Twelfth Supplemental Indenture (the “Proposed Amendments”);

WHEREAS, T-Mobile USA, Inc. (“T-Mobile USA”), on behalf of the Company, has solicited the consent of all holders of the 2033 Notes to certain amendments to the Base Indenture pursuant to the registration statement on Form S-4 (333-287414) (including the documents incorporated by reference therein, the “Registration Statement”) of T-Mobile US, Inc. and T-Mobile USA (together with T-Mobile US, Inc., “T-Mobile”) filed on May 20, 2025 with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended, and the related prospectus dated May 23, 2025, as filed with the Commission pursuant to Rule 424(b) under the Securities Act, relating the offer to exchange any and all validly tendered (and not validly withdrawn) and accepted 2033 Notes for notes to be issued by T-Mobile USA to be fully and unconditionally guaranteed on an unsecured basis by the guarantors described therein;

WHEREAS, the holders of not less than a majority in aggregate principal amount of the 2033 Notes have consented to the Proposed Amendments;

WHEREAS, this Twelfth Supplemental Indenture conforms to the Trust Indenture Act, as required by the Indenture;

WHEREAS, the Company has been authorized by Board Resolution to enter into this Twelfth Supplemental Indenture; and

WHEREAS, all things necessary to make this Twelfth Supplemental Indenture a valid and legally binding agreement of the Company, the Company and the Trustee and a valid amendment of and supplement to the Indenture have been done.

For and in consideration of the premises provided for herein, the Company and the Trustee mutually covenant and agree for the equal and proportionate benefit of the respective holders of the 2033 Notes as follows:

SECTION 1.1 Relation to Indenture. This Twelfth Supplemental Indenture constitutes an integral part of the Base Indenture.

SECTION 1.2 Definitions. For all purposes of this Twelfth Supplemental Indenture, the following terms shall have the respective meanings set forth in this Section:

SECTION 1.3 Rules of Construction. For all purposes of this Twelfth Supplemental Indenture:

(b) all references herein to Articles and Sections, unless otherwise specified, refer to the corresponding Articles and Sections of this Twelfth Supplemental Indenture;

(c) the terms “herein”, “hereof”, “hereunder” and other words of similar import refer to this Twelfth Supplemental Indenture; and

(d) in the event of a conflict with the definition of terms in the Base Indenture, the definitions in this Twelfth Supplemental Indenture shall control.

SECTION 2.1 Amendments to Section 3.02 of the Base Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Sections 3.02(a) and (b) of the Base Indenture, as they apply to the 2033 Notes, shall be amended to delete the stricken text (indicated textually in the same manner as the following example: ) and to add the bold and double-underlined text (indicated textually in the same manner as the following example: bold and double-underlined text) as follows:

(b) Notice to Trustee of Securities to be Redeemed. If less than all the Securities of a series are to be redeemed, the Company shall give the Trustee at least five Business Days’ notice (unless the Trustee shall agree to a shorter period) in advance of the date fixed for the delivery of the notice of redemption to holders of Securities in accordance with Section 3.02(a) above as to the aggregate principal amount of Securities of the series to be redeemed, and thereupon the Trustee shall select, by lot or in such other manner as it shall deem appropriate and fair in its discretion (which may include in accordance with the relevant procedures of the Depositary) and which may provide for the selection of a portion or portions (equal to the smallest denomination of one whole Security of such series or any integral multiple thereof) of the principal amount of such Securities of a denomination larger than the smallest denomination of one whole Security of such series, the Securities to be redeemed and shall thereafter promptly notify the Company in writing of the numbers (if applicable) of the Securities to be redeemed, in whole or in part.

SECTION 2.2 Amendments to Section 4.02 of the Base Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Section 4.02 of the Base Indenture captioned “Maintenance of Office or Agency for Payment, Registration, Transfer and Exchange of Securities,” as it applies to the 2033 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.3 Amendments to Section 4.03 of the Base Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Section 4.03 of the Base Indenture captioned “Paying Agent,” as it applies to the 2033 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.4 Amendments to Section 4.04 of the Base Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Section 4.04 of the Base Indenture captioned “Appointment to Fill Vacancy in Office of Trustee,” as it applies to the 2033 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.5 Amendments to Section 4.05 of the Base Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Section 4.05 of the Base Indenture captioned “Restriction on Consolidation, Merger of the Company,” as it applies to the 2033 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.6 Amendments to Section 4.06 of the Base Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Section 4.06 of the Base Indenture captioned “Original Issue Discount Security,” as it applies to the 2033 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.7 Amendments to Section 5.01 of the Base Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Section 5.01 of the Base Indenture captioned “Company to Furnish Trustee Information as to Names and Addresses of Securityholders,” as it applies to the 2033 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.8 Amendments to Section 5.03 of the Base Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Section 5.03 of the Base Indenture captioned “Delivery Obligations of Company,” as it applies to the 2033 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.9 Amendments to Article 10 of the Base Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Section 10.01 of the Base Indenture captioned “Consolidation or Mergers of Company and Sales or Conveyances of Property of Company,” Section 10.02 of the Base Indenture captioned “Successor to Company” and Section 10.03 of the Base Indenture captioned “Opinion of Counsel” as such provisions apply to the 2033 Notes, shall be deleted in their entirety and in each case replaced with the following: “[Reserved.]”

SECTION 2.10 Amendments to Section 3.1 of the Third Supplemental Indenture and the Fifth Supplemental Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Section 3.1 of the Third Supplemental Indenture and the Fifth Supplemental Indenture captioned “Limitations on Secured Debt,” as it applies to the 2033 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.11 Amendments to Section 3.2 of the Third Supplemental Indenture and the Fifth Supplemental Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Section 3.2 of the Third Supplemental Indenture and the Fifth Supplemental Indenture captioned “Limitation on Sale and Leaseback,” as it applies to the 2033 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.12 Amendments to Section 4.1 of the Third Supplemental Indenture and the Fifth Supplemental Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Section 4.1 of the Third Supplemental Indenture and the Fifth Supplemental Indenture captioned “Additional Events of Default,” as it applies to the 2033 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.13 Amendments to Exhibit A [Form of 6.70% Senior Notes due 2033] to the Third Supplemental Indenture and the Fifth Supplemental Indenture. Subject to Section 2.14 hereof, upon the occurrence of the M&A Closing Event, Exhibit A [Form of 6.70% Senior Notes due 2033] to the Third Supplemental Indenture and the Fifth Supplemental Indenture shall be amended to delete the stricken text (indicated textually in the same manner as the following example: ) and to add the bold and double-underlined text (indicated textually in the same manner as the following example: bold and double-underlined text) as follows:

The redemption price will be calculated on the basis of a 360-day year consisting of twelve 30-day months. The Company will mail notice of any redemption at least five Business Days and not more than 60 days before the redemption date to each registered holder of the Notes to be redeemed. Once notice of redemption is mailed, the Notes called for redemption will become due and payable on the redemption date and at the applicable redemption price, plus accrued and unpaid interest to the redemption date.

SECTION 2.14 Reversion. If the Settlement Date has not occurred within five Business Days following the M&A Closing Event (the “Settlement Deadline”), the amendments effected by Section 2.1 to Section 2.13 shall be deemed null and void as if they had not occurred and, accordingly, any non-compliance that may have occurred on or after the date of this Twelfth Supplemental Indenture and prior to the Settlement Deadline may be the basis for declaring an Event of Default with respect to the 2033 Notes as if this Twelfth Supplemental Indenture had not been executed.

SECTION 5.1 Ratification. The Base Indenture, as supplemented and amended by this Twelfth Supplemental Indenture, is in all respects hereby adopted, ratified and confirmed.

SECTION 5.2 Governing Law. This Twelfth Supplemental Indenture shall be governed by, and construed and enforced in accordance with, the laws of the jurisdiction which govern the Base Indenture and its construction.

SECTION 5.3 Counterparts and Method of Execution. This Twelfth Supplemental Indenture may be executed in several counterparts, all of which together shall constitute one agreement binding on all parties hereto, notwithstanding that all parties have not signed the same counterpart. The exchange of copies of this Supplemental Indenture and of signature pages by electronic transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by electronic transmission shall be deemed to be their original signatures for all purposes. Documents executed, scanned and transmitted electronically and electronic signatures shall be deemed original signatures for purposes of this Supplemental Indenture and all matters related thereto, with such scanned and electronic signatures having the same legal effect as original signatures. The parties agree that this Supplemental Indenture, any addendum or amendment hereto or any other document necessary for the consummation of the transaction contemplated by this Supplemental Indenture may be accepted, executed or agreed to through the use of an electronic signature in accordance with the Electronic Signatures in Global and National Commerce Act (“E-Sign Act”), Title 15, United States Code, Sections 7001 et seq., the Uniform Electronic Transaction Act (“UETA”) and any applicable state law. Electronic signature shall mean any electronic symbol or process attached to, or associated with, a contract or other record and adopted by a person with the intent to sign, authenticate or accept such contract or record. Any document accepted, executed or agreed to in conformity with such laws will be binding on all parties hereto to the same extent as if it were physically executed and each party hereby consents to the use of any third party electronic signature capture service providers as may be reasonably chosen by a signatory hereto.

SECTION 5.4 Section Titles. Section titles are for descriptive purposes only and shall not control or alter the meaning of this Twelfth Supplemental Indenture as set forth in the text.

SECTION 5.5 Trustee. The Trustee makes no representations and is not responsible for the sufficiency, validity or legality of this Twelfth Supplemental Indenture. The statements herein are deemed to be those of the Company and not of the Trustee.

IN WITNESS WHEREOF, the Parties hereto have caused this Twelfth Supplemental Indenture to be duly executed all as of the day and year first above written.

This THIRTEENTH SUPPLEMENTAL INDENTURE, dated as of June 17, 2025 (the “Thirteenth Supplemental Indenture”), is entered into by and among United States Cellular Corporation, a corporation duly organized and existing under the laws of the State of Delaware (the “Company”), and The Bank of New York Mellon Trust Company, N.A. (formerly known as The Bank of New York Trust Company, N.A., as successor to BNY Midwest Trust Company), a national banking association, as trustee (the “Trustee”).

WHEREAS, the Company and the Trustee are parties to an Indenture, dated as of June 1, 2002 (the “Base Indenture”), as supplemented by the Ninth Supplemental Indenture dated as of August 12, 2020 (the “Ninth Supplemental Indenture” and together with the Base Indenture, the “Indenture”) relating to the issuance of the Company’s 6.250% Senior Notes due 2069 (the “2069 Notes”) issued on August 12, 2020, in the aggregate principal amount of $500,000,000;

WHEREAS, the Company desires to amend certain provisions of the Indenture, as set forth in Article Two of this Thirteenth Supplemental Indenture (the “Proposed Amendments”);

WHEREAS, T-Mobile USA, Inc. (“T-Mobile USA”), on behalf of the Company, has solicited the consent of all holders of the 2069 Notes to certain amendments to the Base Indenture pursuant to the registration statement on Form S-4 (333-287414) (including the documents incorporated by reference therein, the “Registration Statement”) of T-Mobile US, Inc. and T-Mobile USA (together with T-Mobile US, Inc., “T-Mobile”) filed on May 20, 2025 with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended, and the related prospectus dated May 23, 2025, as filed with the Commission pursuant to Rule 424(b) under the Securities Act, relating the offer to exchange any and all validly tendered (and not validly withdrawn) and accepted 2069 Notes for notes to be issued by T-Mobile USA to be fully and unconditionally guaranteed on an unsecured basis by the guarantors described therein;

WHEREAS, the holders of not less than a majority in aggregate principal amount of the 2069 Notes have consented to the Proposed Amendments;

WHEREAS, this Thirteenth Supplemental Indenture conforms to the Trust Indenture Act, as required by the Indenture;

WHEREAS, the Company has been authorized by Board Resolution to enter into this Thirteenth Supplemental Indenture; and

WHEREAS, all things necessary to make this Thirteenth Supplemental Indenture a valid and legally binding agreement of the Company, the Company and the Trustee and a valid amendment of and supplement to the Indenture have been done.

For and in consideration of the premises provided for herein, the Company and the Trustee mutually covenant and agree for the equal and proportionate benefit of the respective holders of the 2069 Notes as follows:

SECTION 1.1 Relation to Indenture. This Thirteenth Supplemental Indenture constitutes an integral part of the Base Indenture.

SECTION 1.2 Definitions. For all purposes of this Thirteenth Supplemental Indenture, the following terms shall have the respective meanings set forth in this Section:

SECTION 1.3 Rules of Construction. For all purposes of this Thirteenth Supplemental Indenture:

(b) all references herein to Articles and Sections, unless otherwise specified, refer to the corresponding Articles and Sections of this Thirteenth Supplemental Indenture;

(c) the terms “herein”, “hereof”, “hereunder” and other words of similar import refer to this Thirteenth Supplemental Indenture; and

(d) in the event of a conflict with the definition of terms in the Base Indenture, the definitions in this Thirteenth Supplemental Indenture shall control.

SECTION 2.1 Amendments to Section 3.02 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Sections 3.02(a) and (b) of the Base Indenture, as they apply to the 2069 Notes shall be amended to delete the stricken text (indicated textually in the same manner as the following example: ) and to add the bold and double-underlined text (indicated textually in the same manner as the following example: bold and double-underlined text) as follows:

(b) Notice to Trustee of Securities to be Redeemed. If less than all the Securities of a series are to be redeemed, the Company shall give the Trustee at least five Business Days’ notice (unless the Trustee shall agree to a shorter period) in advance of the date fixed for the delivery of the notice of redemption to holders of Securities in accordance with Section 3.02(a) above as to the aggregate principal amount of Securities of the series to be redeemed, and thereupon the Trustee shall select, by lot or in such other manner as it shall deem appropriate and fair in its discretion (which may include in accordance with the relevant procedures of the Depositary) and which may provide for the selection of a portion or portions (equal to the smallest denomination of one whole Security of such series or any integral multiple thereof) of the principal amount of such Securities of a denomination larger than the smallest denomination of one whole Security of such series, the Securities to be redeemed and shall thereafter promptly notify the Company in writing of the numbers (if applicable) of the Securities to be redeemed, in whole or in part.

SECTION 2.2 Amendments to Section 4.02 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.02 of the Base Indenture captioned “Maintenance of Office or Agency for Payment, Registration, Transfer and Exchange of Securities,” as it applies to the 2069 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.3 Amendments to Section 4.03 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.03 of the Base Indenture captioned “Paying Agent,” as it applies to the 2069 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.4 Amendments to Section 4.04 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.04 of the Base Indenture captioned “Appointment to Fill Vacancy in Office of Trustee,” as it applies to the 2069 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.5 Amendments to Section 4.05 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.05 of the Base Indenture captioned “Restriction on Consolidation, Merger of the Company,” as it applies to the 2069 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.6 Amendments to Section 4.06 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.06 of the Base Indenture captioned “Original Issue Discount Security,” as it applies to the 2069 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.7 Amendments to Section 5.01 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 5.01 of the Base Indenture captioned “Company to Furnish Trustee Information as to Names and Addresses of Securityholders,” as it applies to the 2069 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.8 Amendments to Section 5.03 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 5.03 of the Base Indenture captioned “Delivery Obligations of Company,” as it applies to the 2069 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.9 Amendments to Article 10 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 10.01 of the Base Indenture captioned “Consolidation or Mergers of Company and Sales or Conveyances of Property of Company,” Section 10.02 of the Base Indenture captioned “Successor to Company” and Section 10.03 of the Base Indenture captioned “Opinion of Counsel” as such provisions apply to the 2069 Notes, shall be deleted in their entirety and in each case replaced with the following: “[Reserved.]”

SECTION 2.10 Amendments to Section 11.01 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 11.01(c)(1) of the Base Indenture, as it applies to the 2069 Notes, shall be amended to add the bold and double-underlined text (indicated textually in the same manner as the following example: bold and double-underlined text) as follows:

SECTION 2.11 Amendments to Section 11.01 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Sections 11.01(c)(4) and 11.01(c)(5) of the Base Indenture, as they apply to the 2069 Notes, shall be deleted in their entirety and replaced with the following: “[Reserved.]”

SECTION 2.12 Amendments to Section 2.4 of the Ninth Supplemental Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 2.4 of the Ninth Supplemental Indenture, as it applies to the 2069 Notes, shall be amended to delete the stricken text (indicated textually in the same manner as the following example: ) and to add the bold and double-underlined text (indicated textually in the same manner as the following example: bold and double-underlined text) as follows:

“Optional Redemption. The Notes may be redeemed at the option of the Company, in whole or in part, at any time on and after September 1, 2025 at a redemption price equal to 100% of the principal amount of the Notes being redeemed on the redemption date, plus accrued and unpaid interest thereon to, but not including, the redemption date. The Company shall transmit notice of any redemption at least five Business Days , but not more than 60 days, before the redemption date to each registered holder of the Notes to be redeemed. Once notice of redemption is transmitted, the Notes called for redemption will become due and payable on the redemption date and at the applicable redemption price, plus accrued and unpaid interest to, but not including, the redemption date.”

SECTION 2.13 Amendments to Section 3.1 of the Ninth Supplemental Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 3.1 of the Ninth Supplemental Indenture captioned “Limitations on Secured Debt,” as it applies to the 2069 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.14 Amendments to Section 3.2 of the Ninth Supplemental Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 3.2 of the Ninth Supplemental Indenture captioned “Limitation on Sale and Leaseback,” as it applies to the 2069 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.15 Amendments to Section 4.1 of the Ninth Supplemental Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.1 of the Ninth Supplemental Indenture captioned “Additional Events of Default,” as it applies to the 2069 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.16 Reversion. If the Settlement Date has not occurred within five Business Days following the M&A Closing Event (the “Settlement Deadline”), the amendments effected by Section 2.1 to Section 2.15 shall be deemed null and void as if they had not occurred and, accordingly, any non-compliance that may have occurred on or after the date of this Thirteenth Supplemental Indenture and prior to the Settlement Deadline may be the basis for declaring an Event of Default with respect to the 2069 Notes as if this Thirteenth Supplemental Indenture had not been executed.

SECTION 5.1 Ratification. The Base Indenture, as supplemented and amended by this Thirteenth Supplemental Indenture, is in all respects hereby adopted, ratified and confirmed.

SECTION 5.2 Governing Law. This Thirteenth Supplemental Indenture shall be governed by, and construed and enforced in accordance with, the laws of the jurisdiction which govern the Base Indenture and its construction.

SECTION 5.3 Counterparts and Method of Execution. This Thirteenth Supplemental Indenture may be executed in several counterparts, all of which together shall constitute one agreement binding on all parties hereto, notwithstanding that all parties have not signed the same counterpart. The exchange of copies of this Supplemental Indenture and of signature pages by electronic transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by electronic transmission shall be deemed to be their original signatures for all purposes. Documents executed, scanned and transmitted electronically and electronic signatures shall be deemed original signatures for purposes of this Supplemental Indenture and all matters related thereto, with such scanned and electronic signatures having the same legal effect as original signatures. The parties agree that this Supplemental Indenture, any addendum or amendment hereto or any other document necessary for the consummation of the transaction contemplated by this Supplemental Indenture may be accepted, executed or agreed to through the use of an electronic signature in accordance with the Electronic Signatures in Global and National Commerce Act (“E-Sign Act”), Title 15, United States Code, Sections 7001 et seq., the Uniform Electronic Transaction Act (“UETA”) and any applicable state law. Electronic signature shall mean any electronic symbol or process attached to, or associated with, a contract or other record and adopted by a person with the intent to sign, authenticate or accept such contract or record. Any document accepted, executed or agreed to in conformity with such laws will be binding on all parties hereto to the same extent as if it were physically executed and each party hereby consents to the use of any third party electronic signature capture service providers as may be reasonably chosen by a signatory hereto.

SECTION 5.4 Section Titles. Section titles are for descriptive purposes only and shall not control or alter the meaning of this Thirteenth Supplemental Indenture as set forth in the text.

SECTION 5.5 Trustee. The Trustee makes no representations and is not responsible for the sufficiency, validity or legality of this Thirteenth Supplemental Indenture. The statements herein are deemed to be those of the Company and not of the Trustee.

IN WITNESS WHEREOF, the Parties hereto have caused this Thirteenth Supplemental Indenture to be duly executed all as of the day and year first above written.

This FOURTEENTH SUPPLEMENTAL INDENTURE, dated as of June 17, 2025 (the “Fourteenth Supplemental Indenture”), is entered into by and among United States Cellular Corporation, a corporation duly organized and existing under the laws of the State of Delaware (the “Company”), and The Bank of New York Mellon Trust Company, N.A. (formerly known as The Bank of New York Trust Company, N.A., as successor to BNY Midwest Trust Company), a national banking association, as trustee (the “Trustee”).

WHEREAS, the Company and the Trustee are parties to an Indenture, dated as of June 1, 2002 (the “Base Indenture”), as supplemented by the Tenth Supplemental Indenture dated as of December 2, 2020 (the “Tenth Supplemental Indenture” and together with the Base Indenture, the “Indenture”) relating to the issuance of the Company’s 5.500% Senior Notes due 2070 (the “March 2070 Notes”) issued on December 2, 2020, in the aggregate principal amount of $500,000,000;

WHEREAS, the Company desires to amend certain provisions of the Indenture, as set forth in Article Two of this Fourteenth Supplemental Indenture (the “Proposed Amendments”);

WHEREAS, T-Mobile USA, Inc. (“T-Mobile USA”), on behalf of the Company, has solicited the consent of all holders of the March 2070 Notes to certain amendments to the Base Indenture pursuant to the registration statement on Form S-4 (333-287414) (including the documents incorporated by reference therein, the “Registration Statement”) of T-Mobile US, Inc. and T-Mobile USA (together with T-Mobile US, Inc., “T-Mobile”) filed on May 20, 2025 with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended, and the related prospectus dated May 23, 2025, as filed with the Commission pursuant to Rule 424(b) under the Securities Act, relating the offer to exchange any and all validly tendered (and not validly withdrawn) and accepted March 2070 Notes for notes to be issued by T-Mobile USA to be fully and unconditionally guaranteed on an unsecured basis by the guarantors described therein;

WHEREAS, the holders of not less than a majority in aggregate principal amount of the March 2070 Notes have consented to the Proposed Amendments;

WHEREAS, this Fourteenth Supplemental Indenture conforms to the Trust Indenture Act, as required by the Indenture;

WHEREAS, the Company has been authorized by Board Resolution to enter into this Fourteenth Supplemental Indenture; and

WHEREAS, all things necessary to make this Fourteenth Supplemental Indenture a valid and legally binding agreement of the Company, the Company and the Trustee and a valid amendment of and supplement to the Indenture have been done.

For and in consideration of the premises provided for herein, the Company and the Trustee mutually covenant and agree for the equal and proportionate benefit of the respective holders of the March 2070 Notes as follows:

SECTION 1.1 Relation to Indenture. This Fourteenth Supplemental Indenture constitutes an integral part of the Base Indenture.

SECTION 1.2 Definitions. For all purposes of this Fourteenth Supplemental Indenture, the following terms shall have the respective meanings set forth in this Section:

SECTION 1.3 Rules of Construction. For all purposes of this Fourteenth Supplemental Indenture:

(b) all references herein to Articles and Sections, unless otherwise specified, refer to the corresponding Articles and Sections of this Fourteenth Supplemental Indenture;

(c) the terms “herein”, “hereof”, “hereunder” and other words of similar import refer to this Fourteenth Supplemental Indenture; and

(d) in the event of a conflict with the definition of terms in the Base Indenture, the definitions in this Fourteenth Supplemental Indenture shall control.

SECTION 2.1 Amendments to Section 3.02 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Sections 3.02(a) and (b) of the Base Indenture, as they apply to the March 2070 Notes shall be amended to delete the stricken text (indicated textually in the same manner as the following example: ) and to add the bold and double-underlined text (indicated textually in the same manner as the following example: bold and double-underlined text) as follows:

(b) Notice to Trustee of Securities to be Redeemed. If less than all the Securities of a series are to be redeemed, the Company shall give the Trustee at least five Business Days’ notice (unless the Trustee shall agree to a shorter period) in advance of the date fixed for the delivery of the notice of redemption to holders of Securities in accordance with Section 3.02(a) above as to the aggregate principal amount of Securities of the series to be redeemed, and thereupon the Trustee shall select, by lot or in such other manner as it shall deem appropriate and fair in its discretion (which may include in accordance with the relevant procedures of the Depositary) and which may provide for the selection of a portion or portions (equal to the smallest denomination of one whole Security of such series or any integral multiple thereof) of the principal amount of such Securities of a denomination larger than the smallest denomination of one whole Security of such series, the Securities to be redeemed and shall thereafter promptly notify the Company in writing of the numbers (if applicable) of the Securities to be redeemed, in whole or in part.

SECTION 2.2 Amendments to Section 4.02 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.02 of the Base Indenture captioned “Maintenance of Office or Agency for Payment, Registration, Transfer and Exchange of Securities,” as it applies to the March 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.3 Amendments to Section 4.03 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.03 of the Base Indenture captioned “Paying Agent,” as it applies to the March 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.4 Amendments to Section 4.04 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.04 of the Base Indenture captioned “Appointment to Fill Vacancy in Office of Trustee,” as it applies to the March 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.5 Amendments to Section 4.05 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.05 of the Base Indenture captioned “Restriction on Consolidation, Merger of the Company,” as it applies to the March 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.6 Amendments to Section 4.06 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.06 of the Base Indenture captioned “Original Issue Discount Security,” as it applies to the March 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.7 Amendments to Section 5.01 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 5.01 of the Base Indenture captioned “Company to Furnish Trustee Information as to Names and Addresses of Securityholders,” as it applies to the March 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.8 Amendments to Section 5.03 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 5.03 of the Base Indenture captioned “Delivery Obligations of Company,” as it applies to the March 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.9 Amendments to Article 10 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 10.01 of the Base Indenture captioned “Consolidation or Mergers of Company and Sales or Conveyances of Property of Company,” Section 10.02 of the Base Indenture captioned “Successor to Company” and Section 10.03 of the Base Indenture captioned “Opinion of Counsel” as such provisions apply to the March 2070 Notes, shall be deleted in their entirety and in each case replaced with the following: “[Reserved.]”

SECTION 2.10 Amendments to Section 11.01 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 11.01(c)(1) of the Base Indenture, as it applies to the March 2070 Notes, shall be amended to add the bold and double-underlined text (indicated textually in the same manner as the following example: bold and double-underlined text) as follows:

SECTION 2.11 Amendments to Section 11.01 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Sections 11.01(c)(4) and 11.01(c)(5) of the Base Indenture, as they apply to the March 2070 Notes, shall be deleted in their entirety and replaced with the following: “[Reserved.]”

SECTION 2.12 Amendments to Section 2.4 of the Tenth Supplemental Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 2.4 of the Tenth Supplemental Indenture, as it applies to the March 2070 Notes, shall be amended to delete the stricken text (indicated textually in the same manner as the following example: ) and to add the bold and double-underlined text (indicated textually in the same manner as the following example: bold and double-underlined text) as follows:

“Optional Redemption. The Notes may be redeemed at the option of the Company, in whole or in part, at any time on and after March 1, 2026 at a redemption price equal to 100% of the principal amount of the Notes being redeemed on the redemption date, plus accrued and unpaid interest thereon to, but not including, the redemption date. The Company shall transmit notice of any redemption at least five Business Days , but not more than 60 days, before the redemption date to each registered holder of the Notes to be redeemed. Once notice of redemption is transmitted, the Notes called for redemption will become due and payable on the redemption date and at the applicable redemption price, plus accrued and unpaid interest to, but not including, the redemption date.”

SECTION 2.13 Amendments to Section 3.1 of the Tenth Supplemental Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 3.1 of the Tenth Supplemental Indenture captioned “Limitations on Secured Debt,” as it applies to the March 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.14 Amendments to Section 3.2 of the Tenth Supplemental Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 3.2 of the Tenth Supplemental Indenture captioned “Limitation on Sale and Leaseback,” as it applies to the March 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.15 Amendments to Section 4.1 of the Tenth Supplemental Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.1 of the Tenth Supplemental Indenture captioned “Additional Events of Default,” as it applies to the March 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.16 Reversion. If the Settlement Date has not occurred within five Business Days following the M&A Closing Event (the “Settlement Deadline”), the amendments effected by Section 2.1 to Section 2.15 shall be deemed null and void as if they had not occurred and, accordingly, any non-compliance that may have occurred on or after the date of this Fourteenth Supplemental Indenture and prior to the Settlement Deadline may be the basis for declaring an Event of Default with respect to the March 2070 Notes as if this Fourteenth Supplemental Indenture had not been executed.

SECTION 5.1 Ratification. The Base Indenture, as supplemented and amended by this Fourteenth Supplemental Indenture, is in all respects hereby adopted, ratified and confirmed.

SECTION 5.2 Governing Law. This Fourteenth Supplemental Indenture shall be governed by, and construed and enforced in accordance with, the laws of the jurisdiction which govern the Base Indenture and its construction.

SECTION 5.3 Counterparts and Method of Execution. This Fourteenth Supplemental Indenture may be executed in several counterparts, all of which together shall constitute one agreement binding on all parties hereto, notwithstanding that all parties have not signed the same counterpart. The exchange of copies of this Supplemental Indenture and of signature pages by electronic transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by electronic transmission shall be deemed to be their original signatures for all purposes. Documents executed, scanned and transmitted electronically and electronic signatures shall be deemed original signatures for purposes of this Supplemental Indenture and all matters related thereto, with such scanned and electronic signatures having the same legal effect as original signatures. The parties agree that this Supplemental Indenture, any addendum or amendment hereto or any other document necessary for the consummation of the transaction contemplated by this Supplemental Indenture may be accepted, executed or agreed to through the use of an electronic signature in accordance with the Electronic Signatures in Global and National Commerce Act (“E-Sign Act”), Title 15, United States Code, Sections 7001 et seq., the Uniform Electronic Transaction Act (“UETA”) and any applicable state law. Electronic signature shall mean any electronic symbol or process attached to, or associated with, a contract or other record and adopted by a person with the intent to sign, authenticate or accept such contract or record. Any document accepted, executed or agreed to in conformity with such laws will be binding on all parties hereto to the same extent as if it were physically executed and each party hereby consents to the use of any third party electronic signature capture service providers as may be reasonably chosen by a signatory hereto.

SECTION 5.4 Section Titles. Section titles are for descriptive purposes only and shall not control or alter the meaning of this Fourteenth Supplemental Indenture as set forth in the text.

SECTION 5.5 Trustee. The Trustee makes no representations and is not responsible for the sufficiency, validity or legality of this Fourteenth Supplemental Indenture. The statements herein are deemed to be those of the Company and not of the Trustee.

IN WITNESS WHEREOF, the Parties hereto have caused this Fourteenth Supplemental Indenture to be duly executed all as of the day and year first above written.

This FIFTEENTH SUPPLEMENTAL INDENTURE, dated as of June 17, 2025 (the “Fifteenth Supplemental Indenture”), is entered into by and among United States Cellular Corporation, a corporation duly organized and existing under the laws of the State of Delaware (the “Company”), and The Bank of New York Mellon Trust Company, N.A. (formerly known as The Bank of New York Trust Company, N.A., as successor to BNY Midwest Trust Company), a national banking association, as trustee (the “Trustee”).

WHEREAS, the Company and the Trustee are parties to an Indenture, dated as of June 1, 2002 (the “Base Indenture”), as supplemented by the Eleventh Supplemental Indenture dated as of May 17, 2021 (the “Eleventh Supplemental Indenture” and together with the Base Indenture, the “Indenture”) relating to the issuance of the Company’s 5.500% Notes due 2070 (the “June 2070 Notes”) issued on May 17, 2021, in the aggregate principal amount of $500,000,000;

WHEREAS, the Company desires to amend certain provisions of the Indenture, as set forth in Article Two of this Fifteenth Supplemental Indenture (the “Proposed Amendments”);

WHEREAS, T-Mobile USA, Inc. (“T-Mobile USA”), on behalf of the Company, has solicited the consent of all holders of the June 2070 Notes to certain amendments to the Base Indenture pursuant to the registration statement on Form S-4 (333-287414) (including the documents incorporated by reference therein, the “Registration Statement”) of T-Mobile US, Inc. and T-Mobile USA (together with T-Mobile US, Inc., “T-Mobile”) filed on May 20, 2025 with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended, and the related prospectus dated May 23, 2025, as filed with the Commission pursuant to Rule 424(b) under the Securities Act, relating the offer to exchange any and all validly tendered (and not validly withdrawn) and accepted June 2070 Notes for notes to be issued by T-Mobile USA to be fully and unconditionally guaranteed on an unsecured basis by the guarantors described therein;

WHEREAS, the holders of not less than a majority in aggregate principal amount of the June 2070 Notes have consented to the Proposed Amendments;

WHEREAS, this Fifteenth Supplemental Indenture conforms to the Trust Indenture Act, as required by the Indenture;

WHEREAS, the Company has been authorized by Board Resolution to enter into this Fifteenth Supplemental Indenture; and

WHEREAS, all things necessary to make this Fifteenth Supplemental Indenture a valid and legally binding agreement of the Company, the Company and the Trustee and a valid amendment of and supplement to the Indenture have been done.

For and in consideration of the premises provided for herein, the Company and the Trustee mutually covenant and agree for the equal and proportionate benefit of the respective holders of the June 2070 Notes as follows:

SECTION 1.1 Relation to Indenture. This Fifteenth Supplemental Indenture constitutes an integral part of the Base Indenture.

SECTION 1.2 Definitions. For all purposes of this Fifteenth Supplemental Indenture, the following terms shall have the respective meanings set forth in this Section:

SECTION 1.3 Rules of Construction. For all purposes of this Fifteenth Supplemental Indenture:

(b) all references herein to Articles and Sections, unless otherwise specified, refer to the corresponding Articles and Sections of this Fifteenth Supplemental Indenture;

(c) the terms “herein”, “hereof”, “hereunder” and other words of similar import refer to this Fifteenth Supplemental Indenture; and

(d) in the event of a conflict with the definition of terms in the Base Indenture, the definitions in this Fifteenth Supplemental Indenture shall control.

SECTION 2.1 Amendments to Section 3.02 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Sections 3.02(a) and (b) of the Base Indenture, as they apply to the June 2070 Notes shall be amended to delete the stricken text (indicated textually in the same manner as the following example: ) and to add the bold and double-underlined text (indicated textually in the same manner as the following example: bold and double-underlined text) as follows:

(b) Notice to Trustee of Securities to be Redeemed. If less than all the Securities of a series are to be redeemed, the Company shall give the Trustee at least five Business Days’ notice (unless the Trustee shall agree to a shorter period) in advance of the date fixed for the delivery of the notice of redemption to holders of Securities in accordance with Section 3.02(a) above as to the aggregate principal amount of Securities of the series to be redeemed, and thereupon the Trustee shall select, by lot or in such other manner as it shall deem appropriate and fair in its discretion (which may include in accordance with the relevant procedures of the Depositary) and which may provide for the selection of a portion or portions (equal to the smallest denomination of one whole Security of such series or any integral multiple thereof) of the principal amount of such Securities of a denomination larger than the smallest denomination of one whole Security of such series, the Securities to be redeemed and shall thereafter promptly notify the Company in writing of the numbers (if applicable) of the Securities to be redeemed, in whole or in part.

SECTION 2.2 Amendments to Section 4.02 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.02 of the Base Indenture captioned “Maintenance of Office or Agency for Payment, Registration, Transfer and Exchange of Securities,” as it applies to the June 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.3 Amendments to Section 4.03 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.03 of the Base Indenture captioned “Paying Agent,” as it applies to the June 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.4 Amendments to Section 4.04 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.04 of the Base Indenture captioned “Appointment to Fill Vacancy in Office of Trustee,” as it applies to the June 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.5 Amendments to Section 4.05 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.05 of the Base Indenture captioned “Restriction on Consolidation, Merger of the Company,” as it applies to the June 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.6 Amendments to Section 4.06 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.06 of the Base Indenture captioned “Original Issue Discount Security,” as it applies to the June 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.7 Amendments to Section 5.01 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 5.01 of the Base Indenture captioned “Company to Furnish Trustee Information as to Names and Addresses of Securityholders,” as it applies to the June 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.8 Amendments to Section 5.03 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 5.03 of the Base Indenture captioned “Delivery Obligations of Company,” as it applies to the June 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.9 Amendments to Article 10 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 10.01 of the Base Indenture captioned “Consolidation or Mergers of Company and Sales or Conveyances of Property of Company,” Section 10.02 of the Base Indenture captioned “Successor to Company” and Section 10.03 of the Base Indenture captioned “Opinion of Counsel” as such provisions apply to the June 2070 Notes, shall be deleted in their entirety and in each case replaced with the following: “[Reserved.]”

SECTION 2.10 Amendments to Section 11.01 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 11.01(c)(1) of the Base Indenture, as it applies to the June 2070 Notes, shall be amended to add the bold and double-underlined text (indicated textually in the same manner as the following example: bold and double-underlined text) as follows:

SECTION 2.11 Amendments to Section 11.01 of the Base Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Sections 11.01(c)(4) and 11.01(c)(5) of the Base Indenture, as they apply to the June 2070 Notes, shall be deleted in their entirety and replaced with the following: “[Reserved.]”

SECTION 2.12 Amendments to Section 2.4 of the Eleventh Supplemental Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 2.4 of the Eleventh Supplemental Indenture, as it applies to the June 2070 Notes, shall be amended to delete the stricken text (indicated textually in the same manner as the following example: ) and to add the bold and double-underlined text (indicated textually in the same manner as the following example: bold and double-underlined text) as follows:

“Optional Redemption. The Notes may be redeemed at the option of the Company, in whole or in part, at any time on and after June 1, 2026 at a redemption price equal to 100% of the principal amount of the Notes being redeemed on the redemption date, plus accrued and unpaid interest thereon to, but not including, the redemption date. The Company shall transmit notice of any redemption at least five Business Days , but not more than 60 days, before the redemption date to each registered holder of the Notes to be redeemed. Once notice of redemption is transmitted, the Notes called for redemption will become due and payable on the redemption date and at the applicable redemption price, plus accrued and unpaid interest to, but not including, the redemption date.”

SECTION 2.13 Amendments to Section 3.1 of the Eleventh Supplemental Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 3.1 of the Eleventh Supplemental Indenture captioned “Limitations on Secured Debt,” as it applies to the June 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.14 Amendments to Section 3.2 of the Eleventh Supplemental Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 3.2 of the Eleventh Supplemental Indenture captioned “Limitation on Sale and Leaseback,” as it applies to the June 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.15 Amendments to Section 4.1 of the Eleventh Supplemental Indenture. Subject to Section 2.16 hereof, upon the occurrence of the M&A Closing Event, Section 4.1 of the Eleventh Supplemental Indenture captioned “Additional Events of Default,” as it applies to the June 2070 Notes, shall be deleted in its entirety and replaced with the following: “[Reserved.]”

SECTION 2.16 Reversion. If the Settlement Date has not occurred within five Business Days following the M&A Closing Event (the “Settlement Deadline”), the amendments effected by Section 2.1 to Section 2.15 shall be deemed null and void as if they had not occurred and, accordingly, any non-compliance that may have occurred on or after the date of this Fifteenth Supplemental Indenture and prior to the Settlement Deadline may be the basis for declaring an Event of Default with respect to the June 2070 Notes as if this Fifteenth Supplemental Indenture had not been executed.

SECTION 5.1 Ratification. The Base Indenture, as supplemented and amended by this Fifteenth Supplemental Indenture, is in all respects hereby adopted, ratified and confirmed.

SECTION 5.2 Governing Law. This Fifteenth Supplemental Indenture shall be governed by, and construed and enforced in accordance with, the laws of the jurisdiction which govern the Base Indenture and its construction.

SECTION 5.3 Counterparts and Method of Execution. This Fifteenth Supplemental Indenture may be executed in several counterparts, all of which together shall constitute one agreement binding on all parties hereto, notwithstanding that all parties have not signed the same counterpart. The exchange of copies of this Supplemental Indenture and of signature pages by electronic transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by electronic transmission shall be deemed to be their original signatures for all purposes. Documents executed, scanned and transmitted electronically and electronic signatures shall be deemed original signatures for purposes of this Supplemental Indenture and all matters related thereto, with such scanned and electronic signatures having the same legal effect as original signatures. The parties agree that this Supplemental Indenture, any addendum or amendment hereto or any other document necessary for the consummation of the transaction contemplated by this Supplemental Indenture may be accepted, executed or agreed to through the use of an electronic signature in accordance with the Electronic Signatures in Global and National Commerce Act (“E-Sign Act”), Title 15, United States Code, Sections 7001 et seq., the Uniform Electronic Transaction Act (“UETA”) and any applicable state law. Electronic signature shall mean any electronic symbol or process attached to, or associated with, a contract or other record and adopted by a person with the intent to sign, authenticate or accept such contract or record. Any document accepted, executed or agreed to in conformity with such laws will be binding on all parties hereto to the same extent as if it were physically executed and each party hereby consents to the use of any third party electronic signature capture service providers as may be reasonably chosen by a signatory hereto.

SECTION 5.4 Section Titles. Section titles are for descriptive purposes only and shall not control or alter the meaning of this Fifteenth Supplemental Indenture as set forth in the text.

SECTION 5.5 Trustee. The Trustee makes no representations and is not responsible for the sufficiency, validity or legality of this Fifteenth Supplemental Indenture. The statements herein are deemed to be those of the Company and not of the Trustee.

IN WITNESS WHEREOF, the Parties hereto have caused this Fifteenth Supplemental Indenture to be duly executed all as of the day and year first above written.