Verizon Delaware LLC, 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.

[1] When the AT&T breakup occurred in 1984, DST became managed by the Regional Bell Operating Company Bell Atlantic.

[1] 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".

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