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The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits.
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.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
In Russia, the prefix is "8-800", followed by 7 digits (8-800-XXX-XX-XX). In Serbia, the prefix "0-800", followed by a 6 or 7 digit number, is used. In Singapore, the prefix "1800" followed by a 7 digit number is used. Calling from a mobile phone network will be considered a local call and charges vary among service providers.
Map showing the region covered by area codes 617 and 857 Map of current Massachusetts area codes (since May 2001) Massachusetts area codes from October 1947 until July 1988 Area codes 617 and 857 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of Massachusetts , serving the city of Boston and several ...
Numbering plan areas and area codes of Texas (tan). This is a list of area codes in the U.S. state of Texas.. The date of establishment of each area code is indicated in parentheses: [1]
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This is a list of the area codes in the state of Illinois and its numbering plan areas in the North American Numbering Plan.. All NPAs within Illinois. 217/447: Central Illinois, including the region running west from the Illinois-Indiana border through Danville, Effingham, Champaign–Urbana, Decatur, Springfield, Quincy until Illinois' western border with Missouri and Iowa.