T-Mobile US, Inc. is a wireless network operator in the United States and the German telecommunications company Deutsche Telekom (DT) is a majority shareholder, through its holding company, T-Mobile International AG. Its headquarters are located in Bellevue, Washington.T-Mobile US provides wireless voice, messaging, and data services in the United States, Puerto Rico and the U.S. Virgin Islands under the T-Mobile, MetroPCS and GoSmart Mobile brands.