About AT&TAT&T is a multinational telecommunications corporation that was founded in 1885. The company provides telephone service, internet service, and television service to customers around the world. AT&T is the largest provider of mobile phone service in the United States, and it has a large market share in the global telecommunications market. The company has a long history of innovation and has been a leader in the development of new telecommunications technologies. AT&T has also been a major employer and contributor to the economy of many communities around the world. The company has been criticized for its high prices and its monopoly power in the telecommunications market, but it has also been praised for its contributions to society.