Diamond State Telephone

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Verizon Delaware, Inc.
Type of Company	Holding of Verizon
Founded	1897
Headquarters	Philadelphia, PA, USA (shared with Bell of PA)
Industry	Telecommunications
Products	Local Telephone Service
Website	www.verizon.com

Verizon Delaware, Inc., formerly The Diamond State Telephone Company, is the Bell Operating Company of Delaware, and small parts of southeastern Pennsylvania. Founded in 1897, it became a part of the Bell System in 1905. When the AT&T breakup occurred in 1984, DST became managed by the RBOC Bell Atlantic. In 1994, Bell Atlantic chose to "unify" its brand by legally renaming all of its telephone companies - including Diamond State Telephone to Bell Atlantic - Delaware, Inc.

After the 2000 merger with GTE, Bell Atlantic - Delaware, Inc. became known as Verizon Delaware, Inc.