X0306 4 2017-12-18 0 0001283699 T-Mobile US, Inc. TMUS 0001576259 Miller David A C/O T-MOBILE US, INC. 12920 SE 38TH STREET BELLEVUE WA 98006 0 1 0 0 EVP, General Counsel & Sec. Common Stock 2017-12-18 4 S 0 15000 62.78 D 104448 D The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 15, 2017. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.67 to $63.00. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. /s/ Sarah E. Mock, Attorney-in-Fact 2017-12-20