The Ohio Bell Telephone Company is the Bell Operating Company serving most of Ohio. Cincinnati Bell serves Cincinnati and surrounding communities. After the 1984 Bell System Divestiture, Ohio Bell became a part of Ameritech, one of the 7 original Regional Bell Operating Companies. The Ohio Bell name continued to be used until January 1993, when Ameritech dropped all of their individual Bell Operating Company names in favor of using the corporate name for marketing purposes. In 2002, SBC dropped the Ameritech name in favor of "SBC" as a national brand. Ohio Bell still exists as The Ohio Bell Telephone Company d/b/a AT&T Ohio.

On January 15, 2006, Ohio Bell's legal name was changed to The Ohio Bell Telephone Company d/b/a AT&T Ohio.

After being held by AT&T (pre-1984), Ameritech, and SBC, as of 2005, they are now part of the "new" AT&T.

AT&T | Bell System | Public utilities of the United States | Telecommunications companies of the United States | Telecommunications companies