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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.
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.
WMO country code — ITU callsign prefixes — Guinea. ISO 3166-1 numeric. 324. ISO 3166-1 alpha-3. GIN. ISO 3166-1 alpha-2. GN. ICAO airport code prefix. GU. E.164 ...
Where B is the dialing zone (where the number is located), Y is 2 to 8 (or 9 for pay phones), [2] [failed verification] and X is any digit. Each department belongs to only one dialing zone. Calls from landlines to both landline and mobile numbers are placed by dialing the 10-digit subscriber number with no prefix.
Block the number: Use your phone's built-in blocking features to prevent further contact. For iPhone: Open the message , tap the sender's name or number , select "Info ," then " Block Caller ."
ISO 3166-1 alpha-3 – three-letter country codes which allow a better visual association between the codes and the country names than the alpha-2 codes. ISO 3166-1 numeric – three-digit country codes which are identical to those developed and maintained by the United Nations Statistics Division , with the advantage of script ( writing system ...
ISO 3166-1 alpha-2 – two-letter country codes which are also used to create the ISO 3166-2 country subdivision codes and the Internet country code top-level domains. ISO 3166-1 alpha-3 – three-letter country codes which may allow a better visual association between the codes and the country names than the 3166-1 alpha-2 codes.
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