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Dec 3, 2012 · The North American Numbering Plan (NANP) is the basic numbering scheme permitting interoperable telecommunications services within the U.S., Canada, Bermuda, and most of the Caribbean.Section 251(e)(1) of the Act required the Commission to create or designate one or more impartial entities to administer telecommunications numbering and to make such numbers available on an equitable basis.The ...
In the United Kingdom, telephone numbers are administered by the Office of Communications ().For this purpose, Ofcom established a telephone numbering plan, known as the National Telephone Numbering Plan, which is the system for assigning telephone numbers to subscriber stations.
E.164 is an international standard (ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks. E.164 defines a general format for international telephone numbers.
A closed numbering plan, as found in North America, features fixed-length area codes and local numbers, while an open numbering plan has a variance in the length of the area code, local number, or both of a telephone number assigned to a subscriber line. The latter type developed predominantly in Europe.
South Africa switched to a closed numbering system effective 16 January 2007. At that time, it became mandatory to dial the full 10-digit telephone number, including the zero in the three-digit area code, for local calls (e.g., 011 must be dialed from within Johannesburg). Area codes within the system are generally organized geographically.
However, since the advent of mobile number portability, mobile phone number prefixes can no longer be relied on to determine the current operator behind a particular mobile phone number – only the original operator. As mobile phone plans often include different rates for intra-network calls, it is important for users on such plans to know the ...
The North American Numbering Plan is based on a ten-digit telephone number assigned to each telephone in the telephone network. The number is composed of the three-digit numbering plan area code, a three-digit central office code, and a four-digit station or line number. Certain rules govern the numerical format of each part.
