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  2. International direct dialing - Wikipedia

    en.wikipedia.org/wiki/International_direct_dialing

    Subscriber dialing of international calls typically requires an international call prefix (international dial-out code, international direct dial code, IDD code) to be dialed before the country code. The term international subscriber dialling was used in the United Kingdom and Australia until the terminology was changed to international direct ...

  3. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.

  4. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    A dial plan establishes the expected sequence of digits dialed on subscriber premises equipment, such as telephones, in private branch exchange (PBX) systems, or in other telephone switches to effect access to the telephone networks for the routing of telephone calls, or to effect or activate specific service features by the local telephone ...

  5. National conventions for writing telephone numbers - Wikipedia

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

    If you are dialing from another country the international calling code for Malaysia is "60" which may be confusing; do not dial an extra "0" before the rest of the digits. For fixed line and mobile phone numbers, a dash is written in between the area/mobile code and the subscriber number, with an optional space before the last four digits of ...

  6. E.164 - Wikipedia

    en.wikipedia.org/wiki/E.164

    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]

  7. 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 ...

  8. Country code - Wikipedia

    en.wikipedia.org/wiki/Country_code

    In telecommunications, a country code, or international subscriber dialing (ISD) code, is a telephone number prefix used in international direct dialing (IDD) and for destination routing of telephone calls to a country other than the caller's.

  9. Telephone number - Wikipedia

    en.wikipedia.org/wiki/Telephone_number

    This code specifies that the entire number should be 15 digits or shorter, and begin with an international calling prefix and a country prefix. For most countries, this is followed by an area code, city code or service number code and the subscriber number, which might consist of the code for a particular telephone exchange.