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  2. List of telephone country codes - Wikipedia

    en.wikipedia.org/.../List_of_telephone_country_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. International direct dialing - Wikipedia

    en.wikipedia.org/wiki/International_direct_dialing

    An "international call prefix", "international dial-out code" or "international direct dial code" (IDD code) is a trunk prefix that indicates an international phone call. In the dialling sequence, the prefix precedes the country calling code (and, further, the carrier code, if any, and the destination telephone number ).

  4. 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 ...

  5. 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 ...

  6. List of telephony terminology - Wikipedia

    en.wikipedia.org/wiki/List_of_telephony_terminology

    Direct Dial Central Office (Opposite of DID) US DDD: Direct Distance Dialing: US DDI: Direct Dialing In: UK DECT: Digital Enhanced Cordless Telecommunications DID: Direct Inward Dialing: US DMS: Digital Multiplex System (e.g. DMS-100) Can DNIS: Dialed Number Identification System: US DSL: Digital subscriber line DTMF: dual-tone multi-frequency FDM

  7. International call - Wikipedia

    en.wikipedia.org/wiki/International_call

    In the United Kingdom, there are various ways to make an international call. [1] For users with access to a landline: It can be made directly by dialling the country code together with the destination phone number. This is the most expensive way to call internationally, unless a special arrangement is made with the telephone operator. For ...

  8. Dial plan - Wikipedia

    en.wikipedia.org/wiki/Dial_plan

    Long distance dialing requires the dialing of 1, the three-digit area code, and the seven-digit local number. International numbers of any length are dialed starting with 011. Similarly, telephony service operators may provide dialing sequences for special services, such as directory assistance and emergency services.

  9. List of mobile telephone prefixes by country - Wikipedia

    en.wikipedia.org/wiki/List_of_mobile_telephone...

    example 971 500 000 000 with country code is 12 digits 52: Du: example 971 520 000 000 with country code is 12 digits 53: Virgin Mobile: example 971 530 000 000 with country code is 12 digits 54: Etisalat: example 971 540 000 000 with country code is 12 digits 55: Du: example 971 550 000 000 with country code is 12 digits 56: Etisalat: example ...