BELLEVUE, Wash.--(BUSINESS WIRE)--T-Mobile US, Inc. (NYSE:TMUS) today provided a preliminary view of key customer results for the second quarter of 2015, once again demonstrating continued strong momentum and positive customer response to its Un-carrier moves. The Company generated 2.1 million total net customer additions, including over 1.0 million branded postpaid net customer additions. This marks the ninth consecutive quarter that T-Mobile has delivered over 1 million total net customer add