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  2. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    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.

  3. Telephone numbers in Vietnam - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Vietnam

    To dial a number within the same province or city, only the phone number needs to be dialed. When dialing from a different province/city or from a mobile phone, follow the format 0 + Area Code + Phone Number. At the moment, area codes may have from 2 to 3 digits, while phone numbers may have from 7 to 8 digits, in total, the land line phone ...

  4. Telephone numbers in Asia - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Asia

    No area codes: Telephone numbers in Brunei Cambodia: 8 +855: 00: Open: Telephone numbers in Cambodia China: 8 +86: 00: Telephone numbers in China Cyprus: 3 +357: 00: Telephone numbers in Cyprus Egypt: 2 +20: 00: Telephone numbers in Egypt Georgia: 9 +995: 00: Telephone numbers in Georgia Hong Kong: 8 +852: 001: No area codes: Telephone numbers ...

  5. Lists of country codes - Wikipedia

    en.wikipedia.org/wiki/Lists_of_country_codes

    This is a listing of lists of country codes: List of ISO country codes (ISO 3166) ITU country code (International Telecommunication Union) List of country calling codes E.164; Mobile country code E.212; Maritime identification digits; List of ITU letter codes (radiocommunication division) UIC country code (International Union of Railways) List ...

  6. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    Area code dialing is optional in most geographical area codes, except Moscow (area codes 495, 498, 499); it is mandatory for non-geographical area codes. E.123 international and Microsoft formats are used for writing local phone numbers as well; international prefix and country code 7 are replaced with trunk code 8 (or 8~CC ) when dialing a ...

  7. Country codes: U–Z - Wikipedia

    en.wikipedia.org/wiki/Country_codes:_U–Z

    Notes ^ US does not put a - (dash) after the N on aircraft ex: N1A to N9999Z United States Minor Outlying Islands This article is missing information about United States Minor Outlying Islands. Please expand the article to include this information. Further details may exist on the talk page. (October 2023) Uruguay ISO 3166-1 numeric 858 ISO 3166-1 alpha-3 URY ISO 3166-1 alpha-2 UY ICAO airport ...

  8. List of international call prefixes - Wikipedia

    en.wikipedia.org/wiki/List_of_international_call...

    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, only the symbol + before the country code may be used [citation needed] irrespective of where the telephone is used at that moment; the ...

  9. Country code - Wikipedia

    en.wikipedia.org/wiki/Country_code

    A country code is a short alphanumeric identification code for countries and dependent areas. Its primary use is in data processing and communications . Several identification systems have been developed.