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  2. Area code 021 - Wikipedia

    en.wikipedia.org/wiki/Area_code_021

    021 is: in Brazil, the telephone area code for the city of Rio de Janeiro and surrounding cities (Greater Rio de Janeiro) in China, the telephone area code for the city of Shanghai. in Indonesia, the area code for the city of Jakarta and surrounding cities. in Iran, the telephone area code for the capital city of Tehran.

  3. List of telephone country codes - Wikipedia

    en.wikipedia.org/.../List_of_telephone_country_codes

    An area code of three digits dialed after the country code determines the area served in the United States and its territories, Canada, and much of the Caribbean. Zone 2 uses two 2-digit codes (20, 27) and eight sets of 3-digit codes (21x–26x, 28x, 29x), mostly to serve Africa , but also Aruba , Faroe Islands , Greenland and British Indian ...

  4. List of dialling codes in Brazil - Wikipedia

    en.wikipedia.org/wiki/List_of_dialling_codes_in...

    For international calls to Brazil, the international access code used in the calling country must be dialed (for example, 011 from the United States and Canada, 00 from Europe and most other countries, or the actual "+" sign from some mobile networks), then Brazil's country code 55, then the two-digit area code, then the local eight- or nine ...

  5. 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, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...

  6. Telephone numbers in Iran - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Iran

    The international call prefix depends on the country you are calling from; e.g., 00 for most European countries, and 011 from North America. For domestic calls (within the country), 0 must be dialed before the area code. The prefix for international calls from Iran is 00 (e.g., for a United States number 00 1 ... should be dialed).

  7. 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 ...

  8. Telephone numbers in Pakistan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Pakistan

    Landline numbers and mobile numbers have different structures. Geographically fixed landline are prefixed by an area code which varies in length depending on the significance of the place. Mobile numbers are prefixed (03) followed by a two-digit code indicating the telephone operator. The international country code for Pakistan is +92.

  9. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    The E.164 standard of the International Telecommunication Union is an international numbering plan and establishes a country calling code (country code) for each member organization. Country codes are prefixes to national telephone numbers that denote call routing to the network of a subordinate number plan administration, typically a country ...