T-Mobile US, Inc., often shortened as T-Mobile, is an American wireless network operator headquartered in Bellevue, Washington, U.S. Its largest shareholder is multinational telecommunications company Deutsche Telekom AG, a German company headquartered in Bonn, Germany. As of April 2023, the European company holds a 51.4% majority stake in the company. T-Mobile US is the third-largest wireless carrier in the United States, with 117.9 million subscribers as of December 31, 2023.

Bellevue is a city in the Eastside region of King County, Washington, United States, located across Lake Washington from Seattle. It is the third-largest city in the Seattle metropolitan area, and the fifth-largest city in Washington. It has variously been characterized as a satellite city, a suburb, a boomburb, or an edge city. The population was 151,854 at the 2020 census. The city's name is derived from the French term belle vue.