BELLEVUE, Wash.--(BUSINESS WIRE)--T-Mobile US Inc. (NYSE: TMUS) has built its Un-carrier revolution by listening to customers, and today, the company was again recognized for outstanding customer care. T-Mobile once again topped the customer service performance ranking among the four full-service U.S. wireless providers in the J.D. Power’s 2015 Wireless Customer Care Full-Service Study —Volume 2SM. T-Mobile has now received the highest ranking a total of 13 times—more than half of the 22 times
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