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Area codes 212 and 646 are the area codes for most of the borough of Manhattan in New York City in the North American Numbering Plan (NANP). By area, it is one of the smallest plan areas in North America. It is overlaid by area code 917, which covers the entirety of New York City. ==History== Area code 212 was one of the original 86 area codes assigned by AT&T in 1947. It served the entire five-borough area of New York City. AT&T assigned area codes to the large cities on the basis of the shortest dialing time to minimize resource contention and operator involvement given the rotary dial technology of the time, and thus New York received the shortest code. For most of the next four decades, New York City Zone 1 (NWYRCYZN01) was the world's largest local calling zone. On September 1, 1984, Brooklyn, Queens and Staten Island were split off in area code 718, leaving Manhattan and the Bronx in 212. In 1992, 718 was expanded to include the Bronx, reducing the 212 area to most of Manhattan. In 1992, the entire city was overlaid with area code 917, which was initially planned for only mobile service. Area code 212 was overlaid with area code 646 in Manhattan on July 1, 1999 when new 917 mobile numbers became scarce. On December 16, 2009, the New York Public Service Commission approved an additional overlay of the 718/347 area code region.〔(www3.dps.ny.gov/pscweb/WebFileRoom.nsf/Web/89508A08D5632F518525768E005D09F4/$File/pr09120.pdf?OpenElement ).〕〔(www.askpsc.com/askpsc/page/?PageAction=renderPageById&PageId=3c3e4c3956f92d9c1515975795cea0e1 ).〕 On January 22, 2010, NeuStar-NANPA issued a press release (through PR-NewsWire) that 929 is to be the new area code to further overlay the New York City 718 and 347 area codes of boroughs outside Manhattan.〔(www.prnewswire.com/news-releases/additional-area-code-planned-for-new-york-city-82416587.html ).〕 An additional area code for Manhattan - the fourth serving the area and the seventh serving New York City - is expected to be necessary by 2017, as both 212 and 646 are rapidly becoming depleted of available numbers.〔http://www.ny1.com/nyc/all-boroughs/news/2015/03/25/available-212-area-code-numbers-running-out-.html〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Area codes 212 and 646」の詳細全文を読む スポンサード リンク
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