Telephone country code
Telephone prefix in the international telephone numbering plan
Telephone country code
A telephone country code is a country-specific telephone number prefix for international direct dialing (IDD), a system for reaching telephone service subscribers in foreign areas via international telecommunication networks. Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a foreign region other than the caller's. They are dialed before the national telephone number. Typically, dialing a foreign telephone number, requires at least one additional prefix, the international call prefix which is an exit code from the national numbering plan to the international one. It essentially requests and reserves an international telephone circuit for the call. IITU standards recommend the digit sequence 00 for this prefix and most countries comply. The prefix is 011 in the countries of the North American Numbering Plan...
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