'''American Telephone and Telegraph (AT&T)''' is the 20th largest telephone company worldwide. The original American Telephone & Telegraph, sometimes referred to as "The Bell System" or "Ma Bell," was split into eight separate regional bell operating companies in 1984 following an antitrust lawsuit. | '''American Telephone and Telegraph (AT&T)''' is the 20th largest telephone company worldwide. The original American Telephone & Telegraph, sometimes referred to as "The Bell System" or "Ma Bell," was split into eight separate regional bell operating companies in 1984 following an antitrust lawsuit. |