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Learn about the history and usage of telephone exchange names or central office names, which were assigned to switching systems in different localities. Find out how they were dialed, displayed, and replaced by numeric systems in various countries.
Find out the telephone prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks. The list is organized by world zones and includes the ITU-T standards and the exceptions for political and historical alignment.
Learn about the format, prefixes, and area codes of Canadian telephone numbers, as well as the history and regulation of the North American Numbering Plan. The country code for Canada is 1, which is used for international access and trunk prefix.
A telephone prefix is the first set of digits after the country and area codes of a phone number. In North America, it is the first three digits of a local number, and in other countries it may have different lengths and meanings.
Learn how to dial international phone numbers from Australia and other countries using different prefixes. Find out the meaning of 0011, 000, 009 and other codes, and see the list of historic and current prefixes.
The North American Numbering Plan (NANP) is a telephone numbering system for twenty-five regions in twenty countries, mainly in North America and the Caribbean. It uses the country code 1 and divides the territories into numbering plan areas (NPAs) with three-digit area codes.
Find the area code for any location in North America, including the United States, Canada, and some Caribbean countries. The web page shows the numerical order, territory, date, and notes for each area code, including the overlay and split history.
Find the mobile prefixes for different countries and territories, including Afghanistan, Åland, Algeria, American Samoa, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Aruba, Ascension Island, Australia, Austria, etc. The web page also shows the international calling codes, the size of NN (NSN), and the carriers for each prefix.