FORTY-NINTH SUPPLEMENTAL INDENTURE

Exhibit 4.15

EXECUTION VERSION

FORTY-NINTH SUPPLEMENTAL INDENTURE

FORTY-NINTH SUPPLEMENTAL INDENTURE (this “Forty-Ninth Supplemental Indenture”), dated as of March 30, 2021, among T-Mobile USA, Inc. (the “Company”), the entities listed on Schedule I hereto (the “New Guarantors”), the existing guarantors signatory hereto (the “Existing Guarantors”) and Deutsche Bank Trust Company Americas, as trustee under the Indenture referred to below (the “Trustee”).

WITNESSETH:

WHEREAS, Section 4.17 of the Indenture provides that under certain circumstances the Company is required to cause the New Guarantors to execute and deliver to the Trustee a supplemental indenture pursuant to which the New Guarantors shall become Guarantors of the applicable Notes on the terms and conditions set forth herein; and

WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee, the Company, the Existing Guarantors and the New Guarantors are authorized to execute and deliver this Forty-Ninth Supplemental Indenture.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Company, the New Guarantors, the Existing Guarantors and the Trustee mutually covenant and agree for the benefit of the Holders of the applicable Notes as follows:

1.       Defined Terms. As used in this Forty-Ninth Supplemental Indenture, capitalized terms used but not defined herein shall have the meaning set forth in the Indenture. The words “herein,” “hereof” and “hereby” and other words of similar import used in this Forty-Ninth Supplemental Indenture refer to this Forty-Ninth Supplemental Indenture as a whole and not to any particular section hereof.

2.       Agreement to Guarantee. The New Guarantors hereby agree to unconditionally guarantee, and the Existing Guarantors hereby affirm their unconditional guarantee of, the Company’s obligations under the Notes and the Indenture on the terms and subject to the conditions set forth in the Indenture including but not limited to ARTICLE X thereof.

3.       Notices. All notices or other communications to the Company and the New Guarantors shall be given as provided in Section 12.02 of the Indenture.

4.       Ratification of Indenture; Supplemental Indentures Part of Indenture. Except as expressly contemplated hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect.

5.       Governing Law. THIS FORTY-NINTH SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.

6       The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Forty-Ninth Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the New Guarantors and the Company.

7.       Counterpart Originals. This Forty-Ninth Supplemental Indenture may be executed in any number of counterparts and by the parties hereto in separate counterparts, each of which when so executed will be deemed to be an original and all of which taken together will constitute one and the same agreement. The exchange of copies of this Forty-Ninth Supplemental Indenture and of signature pages by facsimile or PDF transmission shall constitute effective execution and delivery of this Forty-Ninth Supplemental Indenture as to the parties hereto and may be used in lieu of the original Forty-Ninth Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF transmission shall be deemed to be their original signatures for all purposes. The parties may sign any number of copies of this Forty-Ninth Supplemental Indenture. Each signed copy will be an original, but all of them together represent the same agreement.

8.       Headings, etc. The headings of the Articles and Sections of this Forty-Ninth Supplemental Indenture have been inserted for convenience of reference only, are not to be considered a part of this Forty-Ninth Supplemental Indenture and will in no way modify or restrict any of the terms or provisions hereof.

[Signatures on following page]

[Forty-Ninth Supplemental Indenture]

[Forty-Ninth Supplemental Indenture]

[Forty-Ninth Supplemental Indenture]

[Forty-Ninth Supplemental Indenture]

[Forty-Ninth Supplemental Indenture]

[Forty-Ninth Supplemental Indenture]

Schedule I

I-1