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The North American Numbering Plan ( NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1. Some North American countries, most notably Mexico, do not participate with the NANP.
National conventions for writing telephone numbers vary by country. The International Telecommunication Union (ITU) publishes a recommendation entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses.
For example, a telephone number in North America consists of a three-digit area code, a three-digit central office code, and four digits for the line number.
Telephone numbers in the Americas. The prefixes in the Americas start with one of 1,2,5. All countries in the Americas use codes that start with "5", with the exception of the countries of the North American Numbering Plan, such as Canada and the United States, which use country code 1, and Greenland and Aruba with country codes starting with ...
E.164 specifies that a telephone number consist of a country code and a national telephone number. National telephone numbers are defined by national or regional numbering plans, such as the European Telephony Numbering Space , the North American Numbering Plan (NANP), or the UK number plan .
Ten-digit dialing is a telephone dialing procedure in the countries and territories that are members of the North American Numbering Plan (NANP). It is the practice of including the area code of a telephone number when dialing to initiate a telephone call.
Destinations in Mexico are dialed from foreign location by dialing the foreign country's International access code ( 011 in the US, 00 in many other countries), the country code 52, and the ten-digit national telephone number of the destination.
Area codes 212, 646, and 332 are area codes in the North American Numbering Plan (NANP) for most of the borough of Manhattan in New York City. By area, it is one of the smallest numbering plan areas (NPAs). [1] The three area codes form an overlay numbering plan, and are also overlaid by area code 917 of a numbering plan area that comprises the ...
In the 1940s, the American Telephone and Telegraph Company (AT&T) devised the first comprehensive continental telephone numbering plan to implement destination routing in Operator Toll Dialing with the goal of speeding the connection times in long-distance telephony.
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.