T-Mobile USA is a national provider of wireless voice, messaging, and data services. The company is one of the fastest growing wireless companies in the country. Headquartered in Bellevue, Wash., it has a staff of more than 36,000 employees. The company serves over 110 million customers in the world. T-Mobile USA offers phone services that include roaming and unlimited long-distance calling. In addition, the company provides call forwarding and caller identification services. It maintains a store in Irvine, Calif. T-Mobile USA is the United States operating entity of Deutsche Telekom AG s Mobile Communications Business. The company is a wholly owned subsidiary of T-Mobile International, which is one of the world s leading companies in mobile communications.