When the
American Telephone and Telegraph Company (AT&T) devised the first nationwide
telephone numbering plan for
Operator Toll Dialing in the 1940s, New York state was initially divided into five numbering plan areas, the most of any state, assigning a distinct area code to each. In 1947, area code 716 was assigned to an area with a significant portion of
Central New York, as far east as
Corning. In 1954, the numbering plan area was reduced in size by merging its eastern portion with the southern portion of
NPA 315, to create
area code 607. As a result,
New York Public Service Commission approved area code 624, and was assigned to form an all-service
overlay complex in the 716 area, with an in-service date of November 16, 2023. ==Service area==