BELLEVUE, Wash.--(BUSINESS WIRE)--T-Mobile US, Inc. (NYSE:TMUS): Second Quarter 2015 Highlights: Continued customer momentum and low churn for the fastest growing wireless company in America: 2.1 million total net adds – 9th consecutive quarter of over 1 million 1.0 million branded postpaid net adds – 4th consecutive quarter of over 1 million 760,000 branded postpaid phone net adds – expect to capture all of the industry postpaid phone growth Continued low branded postpaid phone churn of 1.3% –