BELLEVUE, Wash.--(BUSINESS WIRE)--T-Mobile (NYSE: TMUS) today announced it will once again offer Un-carrier customers a subscription to the premium features of Major League Baseball’s official ‘MLB.com At Bat’ app throughout the regular 2015 season−completely free of charge. The updated app includes powerful features like live look-ins, Statcast, Apple Watch support, live home and away radio broadcast feeds, the free Game of the Day, pitch tracking, as well as in-depth team and player informati