Dobson Communications Corporation, through its subsidiaries, provides wireless communications services in the United States. The company offers digital voice, data, and various featured services to its customers primarily through global system for mobile communications (GSM), general packet radio service, and enhanced data for GSM evolution networks. It offers wireless voice and data services, as well as various custom-calling features, including voice mail, call forwarding, call waiting, three way calling, no answer transfer, caller ID, message waiting indicator, sleep mode for longer battery life, and mobile originated and mobile terminated short message service. The company, through the deployment of GSM technology, provides wireless data services that enable to access the Internet to send and receive pictures and video, and to download games and music. The company sells and distributes wireless services through its retail stores, independent dealers, direct sales representatives, and third party resellers. As of December 31, 2006, it served approximately 1.7 million customers in 17 states. The company, formerly known as Dobson Telephone Company, was founded in 1936 and is headquartered in Oklahoma City, Oklahoma. As of November 15, 2007, Dobson Communications Corp. is a subsidiary of AT&T Inc. (NYSE:T).