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Although the original purpose for the number was for the Social Security Administration to track individuals, [1] the Social Security number has become a de facto national identification number for taxation and other purposes. [2] A Social Security number may be obtained by applying on Form SS-5, Application for a Social Security Number Card. [3]
A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC).
The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union.
Some mobile telephone numbers from the 1990s assigned to communities in the area surrounding 617 (which is now the 781 area code) kept the 617 area code after the split. Area code 508 was split from 617 on July 16, 1988. Area code 978 subsequently split from 508 on September 1, 1997. Area code 781 was split from 617 on September 1, 1997.
Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.
A DOD identification card number usually matches the holder's Social Security Number. However, on June 1, 2011, the DOD began phasing out use of the SSN to protect service members' identities. [ 18 ] It was replaced with a 10-digit DOD ID Number and a 12-digit Benefits ID Number.
The new area code, which spells out IND on a standard telephone keypad, made 317 the second Indiana area code to be overlaid after area code 812 was overlaid with 930 in March 2015. [3] Area code 463 entered service on March 15, 2016. On that date, a permissive dialing period began during which both seven- and ten-digit calls would be able to ...
Area codes in New York state; area codes 518 and 838 highlighted in light green. Area codes 518 and 838 are telephone area codes in the North American Numbering Plan for eastern Upstate New York in the United States. 518 is one of the 86 original North American area codes created in 1947. Area code 838 was added to the 518 numbering plan area ...
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