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There is an international format for recording a telephone number containing the country code, settlement code and telephone number, and the national format containing the settlement code and telephone number. To record Ukrainian telephone numbers, telephone codes for settlements do not have an initial zero, long-distance prefix: 0.
The number is presented starting the country calling code. This is called the globalized format of an E.164 number, and is defined in the Internet Engineering Task Force RFC 2806. [6] The international calling prefix is a trunk code to reach an international circuit in the country of call origination. [7]
This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...
a notation when writing a number in international format, for example +1 202 456 1414 (the U.S. White House switchboard), and; a diallable character (either hold down "0" (zero), or double-click "*" (star)), on GSM and other cellular (mobile) telephones, which acts as the outgoing international call prefix independent of location.
Parentheses are not allowed in the international notation, according to the standard, as international callers use fixed number dialing. For digit grouping, E.123 specifically recommends that: only spaces be used to visually separate groups of numbers "unless an agreed upon explicit symbol (e.g. hyphen) is necessary for procedural purposes" in ...
Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
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Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.