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The Regional Bell Operating Companies (RBOC) refers to the seven regional local exchange carriers formed after the breakup of AT&T in 1984.


The RBOCs of roughly equal size were formed as a result of the 1982 AT&T Consent Decree that AT&T signed with the U.S. Department of Justice, stipulating that it would divest itself of its 22 wholly-owned telephone operating companies. At the time of the consent decree, there were seven RBOCs — Ameritech, Bell Atlantic, BellSouth, NYNEX, Pacific Telesis, Southwestern Bell and U.S. West.

After a series of acquisitions, mergers and name changes (including one in which a combination of several RBOCs reclaimed the original AT&T name), only three of the original seven remain. They are AT&T, Qwest and Verizon. The RBOCs are the Incumbent Local Exchange Carrier (ILECs) in their local markets.


  • "The Broadband Availability Gap," OBI Technical Paper No 1, Glossary, at 135 (full-text).