X0306 4 2017-02-25 0 0001283699 T-Mobile US, Inc. TMUS 0001182438 SIEVERT G MICHAEL C/O T-MOBILE US, INC. 12920 SE 38TH STREET BELLEVUE WA 98006 0 1 0 0 Chief Operating Officer Common Stock 2017-02-25 4 A 0 115798 0.0000 A 414844 D Common Stock 2017-02-25 4 F 0 31415 62.21 D 383429 D Represents restricted stock units granted under the issuer's 2013 Omnibus Incentive Plan (the "Plan"); with respect to 57,899 of such units, one-third of the units vest on each of February 25, 2018, February 25, 2019 and February 25, 2020, and with respect to 57,899 of such units, all units vest in full on February 25, 2019, in each case subject to the terms of the Plan and such award. Represents shares withheld for payment of taxes on vesting of restricted stock units; not an open market transaction. /s/ Sarah E. Mock, Attorney-in-Fact 2017-02-28