UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): June 6, 2016

T-MOBILE US, INC.

(Exact Name of Registrant as Specified in Charter)

Registrant’s telephone number, including area code: (425) 378-4000

(Former Name or Former Address, if Changed Since Last Report):

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Item 1.01 — Entry into a Material Definitive Agreement

On June 6, 2016, T-Mobile US, Inc. (the “Company”) amended and restated the terms of its November 18, 2015 revolving securitization facility of unsecured handheld device installment plan receivables to increase the maximum purchase commitment thereunder from $800 million to $1.3 billion (as amended and restated, the “EIP Receivables Facility”). The $1.3 billion purchase commitment is scheduled to expire on November 19, 2017.

In connection with the EIP Receivables Facility, T-Mobile Financial LLC, a wholly-owned subsidiary of the Company (“Finco”), and T-Mobile Handset Funding LLC, a special purpose entity and wholly-owned subsidiary of Finco (“T-Mobile Funding”), have entered into an Amended and Restated Receivables Sale Agreement, dated as of June 6, 2016 (the “Receivables Sale Agreement”), by and between Finco, as seller, and T-Mobile Funding, as purchaser, pursuant to which Finco from time to time sells and/or contributes certain of its unsecured handheld device installment plan receivables (and related assets) to T-Mobile Funding. Immediately after acquiring the receivables from Finco under the Receivables Sale Agreement, T-Mobile Funding sells such receivables to Royal Bank of Canada (“RBC”), as agent for certain financial institutions party thereto from time to time (collectively, the “Purchasers”), pursuant to an Amended and Restated Receivables Purchase and Administration Agreement, dated as of June 6, 2016 (the “Receivables Purchase and Administration Agreement”), among T-Mobile Funding, Finco, the Company, RBC and the Purchasers. Receivables are sold to the Purchasers on a revolving basis throughout the term of the EIP Receivables Facility.

As of June 6, 2016, the Purchasers own receivables with an aggregate net outstanding balance of approximately $1.6 billion which were purchased under the Receivables Purchase and Administration Agreement for a discounted cash purchase price of approximately $1.2 billion and a deferred purchase price payable from collections on the receivables.

The Purchasers have limited rights of recourse against T-Mobile Funding with respect to transfers of the receivables under the Receivables Purchase and Administration Agreement, pursuant to which T-Mobile Funding will be required to repurchase certain written-off receivables and ineligible receivables and deposit cash or replacement receivables in certain circumstances for contracts terminated by customers under the Company’s JUMP! program. T-Mobile Funding, in turn, has parallel limited rights of recourse against Finco under the Receivables Sale Agreement. Finco will service and administer the receivables on behalf of the Purchasers and T-Mobile Funding for a monthly servicing fee. The Company has provided the Purchasers with a performance guarantee of the obligations of Finco, in its capacities as servicer under the Receivables Purchase and Administration Agreement and seller under the Receivables Sale Agreement.

The EIP Receivables Facility contains representations and warranties, affirmative and negative covenants, and events of default that are similar to comparable securitization transactions. While the transaction has been structured as a sale for accounting and legal purposes, the Company will not treat the transaction as a sale for federal and state tax purposes.

This summary of the EIP Receivables Facility does not purport to be complete and is qualified in its entirety by reference to the full text of each of the Receivables Sale Agreement and the Receivables Purchase and Administration Agreement, copies of which are attached hereto as Exhibits 10.1 and 10.2, respectively.

Item 9.01 — Financial Statements and Exhibits

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

INDEX TO EXHIBITS