Bell founded American Bell in 1875 to develop and market his invention, which founded American Telephone & Telegraph as a subsidiary in 1885. AT&T, as it is now called, has undergone many changes since then but remains profitable today. | Bell founded American Bell in 1875 to develop and market his invention, which founded American Telephone & Telegraph as a subsidiary in 1885. AT&T, as it is now called, has undergone many changes since then but remains profitable today. |