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  • E. 164 - Wikipedia
    E 164 defines a general format for international telephone numbers Plan-conforming telephone numbers are limited to only digits and to a maximum of fifteen digits [1] The specification divides the digit string into a country code of one to three digits, and the subscriber telephone number of a maximum of twelve digits
  • Telephone number - Wikipedia
    A telephone number typically consists of a sequence of digits, but historically letters were also used in connection with telephone exchange names Telephone numbers facilitate the switching and routing of calls using a system of destination code routing [1]
  • National conventions for writing telephone numbers - Wikipedia
    Telephone numbers in Kenya use a 9-digit format The nine digits used for local calls start with a "0" (trunk prefix) for domestic calls, followed by the 3-digit area provider code and the final six digits (07XX XXX XXX) The international code for Kenya is "+254"
  • North American Numbering Plan - Wikipedia
    All-number calling was a telephone numbering plan introduced in 1958, [37] that converted telephone numbers with exchange names to a numeric representation of seven digits
  • Telephone numbers in the Americas - Wikipedia
    All countries in the Americas use telephone country 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 the digit 2, which otherwise is mostly used by countries in Africa
  • List of telephone country codes - Wikipedia
    Telephone country codes are telephone number prefixes for reaching subscribers in foreign countries or areas by international direct dialing (IDD) Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E 123 and E 164 and constitute the international telephone numbering plan of the public switched telephone network (PSTN) and other networks
  • North American Numbering Plan expansion - Wikipedia
    The expansion of the North American Numbering Plan (NANP) is the anticipated requirement for providing more telephone numbers to accommodate future needs beyond the pool of ten-digit telephone numbers Ten-digit telephone numbers have been in use in the United States and Canada in long-distance telephone service since the 1950s
  • List of North American Numbering Plan area codes - Wikipedia
    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 A numbering plan area may have multiple area codes assigned, a configuration
  • Toll-free telephone number - Wikipedia
    A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls For the calling party, a call to a toll-free number is free of charge, unless air-charges apply for mobile telephone service A toll-free number is identified by a dialing prefix similar to an area code The specific service access varies by country
  • Telephone numbers in Europe - Wikipedia
    A call within the same city or within an area is dialed only by the subscriber number, while for calls outside the area, the telephone number must be prefixed with the destination area code A fixed dialing plan requires to dial all digits of the complete telephone number, including any area codes





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