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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 dialling codes in Pakistan - Wikipedia

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

    The area codes in Pakistan consists of two to five digits; generally smaller the city, longer the prefix. All large cities have two-digit codes. The smaller towns might have six digital whereas big cities have seven digit numbers. Azad Kashmir telephone lines contain five digits. On 1 July 2009, telephone numbers in Karachi and Lahore were ...

  4. List of dialling codes in Brazil - Wikipedia

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

    Two border cities in the State of Paraná are contiguous with larger cities in Santa Catarina and use area codes from the latter state: Rio Negro (contiguous with Mafra) uses area code 47, and Barracão (contiguous with Dionísio Cerqueira) uses area code 49. Conversely, the border city of Porto União in the State of Santa Catarina is ...

  5. Telephone numbers in Pakistan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Pakistan

    Area codes in Pakistan are from two to five digits long; the smaller the city, the longer the prefix. All the large cities have two-digit codes. Smaller towns have a six digit number. Azad Jammu and Kashmir has six digit numbers as well. Large cities have seven digit numbers.

  6. List of telephone country codes - Wikipedia

    en.wikipedia.org/.../List_of_telephone_country_codes

    Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as "country dial-in codes", or historically "international subscriber dialing" (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.

  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. History of telephone numbers in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/History_of_telephone...

    Of the 16 area codes freed up for alternative use in the 1980s, at least 11 were re-used for other services. For example, the 0401 area code was re-allocated to Cellnet mobile services. Five of the area codes remained unused, including 01632, which is now partially reserved for fictitious telephone numbers. In 1995, the PhONEday changes for ...

  9. Telephone numbers in Iran - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Iran

    An example for calling telephones in the city of ... (within Tehran, via a landline) 021 XXXX XXXX (within ... 2nd digit after 091 is the code of mobile number ...