T-Mobile US (TMUS) 8-K Other Events

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement on FormS-8 (No.333-189095) and in the Registration Statements on FormS-3 (Nos.333-210920 and333-210918) ofT-Mobile US, Inc. of our report dated February 14, 2017, except for the effects of the change in presentation of the imputed discount on Equipment Installment Plan receivables as described in Note 1, as to which the date is January 22, 2018, relating to the financial statements and the effectiveness of internal control over financial reporting, which appears inT-Mobile US, Inc.’s Current Report on Form8-K dated January 22, 2018.

/s/ PricewaterhouseCoopers LLP

Seattle, Washington

January 22, 2018