T-Mobile US, Inc., together with its subsidiaries, provides mobile communications services in the United States, Puerto Rico, and the U.S. Virgin Islands. The company offers voice, messaging, and data services in the postpaid, prepaid, and wholesale markets. It also provides wireless devices, such as smartphones, tablets, and other mobile communication devices, as well as accessories, which are manufactured by various suppliers. It offers services, devices, and accessories through its owned and operated retail stores, as well as through its Websites. T-Mobile US, Inc. also sells its devices and accessories to dealers and other third party distributors for resale through independent third-party retail outlets and various third-party Websites. The company provides its services under the T-Mobile and MetroPCS brands. As of December 31, 2014, it provided services to approximately 55 million customers. T-Mobile US, Inc. was founded in 1994 and is headquartered in Bellevue, Washington. T-Mobile US, Inc. operates as a subsidiary of Deutsche Telekom AG.