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The 555 exchange is not reserved in area codes used for toll-free phone numbers. This led to the video game The Last of Us accidentally including the number to a phone-sex operator. [9] The number "555-2368" (or 311-555-2368) is a carryover from the "EXchange 2368" ("Exchange CENTral") number common in telephone advertisements as early as the ...
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
Area code Year Current region 212: 1947 New York City: Manhattan only; component of 212/332/646 and 917 overlays 315: 1947 Syracuse, Utica, Watertown, and north central New York; component of 315/680 overlay 329: 2023: Poughkeepsie, Middletown, Newburgh, West Point, Goshen and southeastern New York; component of 845/329 overlay 332: 2017
The solution for expanding the numbering pool within an NPA was to remove the restriction posed by not using 0 and 1 in the middle position of central office codes. This made central office codes interchangeable. An interchangeable NPA code and an interchangeable central office code is a code that permits any of the ten numerals in the middle ...
The state's Public Utilities Commission also uses the prefix for one of its customer service lines. [27] The reservation applies to all geographic North American Numbering Plan area codes. 555 or a variant remains potentially valid outside North America; New Zealand uses mobile *555 to report traffic collisions. [28]
The combination of NPA code and central office code served as a destination routing code for use by operators to reach any central office through the switching network. [24] Due to the numerical structure of the numbering system, each NPA was technically limited to 540 central offices.
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New York (New York City: Manhattan only, except for Marble Hill) 1947: created for all of New York City; 1984: split to create 718 for Brooklyn, Queens, and Staten Island; 1992: the Bronx switched to 718; 1992: overlaid by 917; 1999: overlaid by 646; 2017: overlaid by 332; 213: California (central area of Los Angeles) 1947: created for the ...