144 0000946770 XXXXXXXX LIVE 0001283699 T-Mobile US, Inc. 001-33409 12920 SE 38TH STREET BELLEVUE WA 98006 800-318-9270 Deutsche Telekom AG 10% Stockholder Common Stock TD Securities (USA) LLC

1 Vanderbilt Avenue New York NY 10017

4330129 999999991.26 1135445108 06/12/2025 NASDAQ Common Stock 05/31/2001 Merger or Acquisition Issuer N 4330129 05/31/2001 Not Applicable Y Deutsche Telekom Holding B.V. ("DT Holding"), an indirect wholly-owned subsidiary of Deutsche Telekom AG, holds the shares to be sold. On March 13, 2025, DT Holding entered into a Rule 10b5-1 trading plan with TD Securities (USA), LLC (the "TD Plan"), which contemplates sales of up to 4,330,129 shares of Common Stock. Aggregate Market Value of shares is calculated based on a closing share price of $230.94 on June 11, 2025. Any sales by the reporting person will occur under the terms of the TD Plan, which contemplates sales of the Common Stock from June 12, 2025, through September 10, 2025, under the parameters set forth in such trading plan. 06/11/2025 03/13/2025 /s/ Christoph Appel