three major American telecom operators: at&; T、VERIAZON、SPRINT-NEXTEL。 \xd\AT& T company is the largest fixed-line telephone service provider and the second largest mobile phone service provider in the United States, and also provides broadband and pay TV services. A total of 15 million households provide services, of which 85.1 million are wireless users. Southwest Bell Company was founded in 1983, which is one of the independent companies established according to the judgment of the anti-monopoly lawsuit between the US government and AT&T Company. In 1995, Southwest Bell Company changed its name to SBC Communication Company, and in 25, it acquired AT&T Company and changed its name to AT&; T Company, in addition, has inherited the trademark originally held by AT&T Company and the listing code T (meaning telephone) on the new york Stock Exchange. \xd\Verizon was formed by the merger of two original Bell operating companies in the United States-Atlantic Bell and Nynex, and the independent telephone company GTE. After the formal merger, Verizon became the largest local telephone company in the United States, the largest wireless communication company and the largest provider of printed yellow pages and online yellow pages information in the world. Verizon operates telecommunications and wireless services in 45 countries around the world, including the United States, Europe, Asia and the Pacific. The company is listed on the new york Stock Exchange. On September 2, 213, the company signed an agreement with Vodafone Group to pay $13 billion to acquire 45% equity of Verizon Wireless held by Vodafone, which exceeded the market value of Google. \xd\Sprint Nextel is the third largest mobile operator in America. \xd\Sprint Nextel is a global communication company, serving more than 26 million commercial and residential customers in more than 1 countries and regions. The company has about 7, employees all over the world, with an annual turnover of $27 billion. It has always been praised by all parties for the development, engineering and promotion of cutting-edge network technology. And has the first nationwide, all-digital optical fiber network in the United States, as well as the award-winning Tier 1 IP network. Sprint Company provides local voice and data communication services in 18 states in the United States, and has the largest 1% digital and nationwide PCS personal wireless communication network in the United States.