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  2. International direct dialing - Wikipedia

    en.wikipedia.org/wiki/International_direct_dialing

    International direct dialing ( IDD) or international subscriber dialling ( ISD) is placing an international telephone call, dialed directly by a telephone subscriber, rather than by a telephone operator. Subscriber dialing of international calls typically requires an international call prefix ( international dial-out code, international direct ...

  3. International call - Wikipedia

    en.wikipedia.org/wiki/International_call

    International telephone calls are those made between different countries. These telephone calls are processed by international gateway exchanges (switches). Charges for these calls were high initially but declined greatly during the 20th century due to advances in technology liberalization. Originally they were placed via long-distance operators.

  4. 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.

  5. Collect call - Wikipedia

    en.wikipedia.org/wiki/Collect_call

    A collect call in Canada and the United States, known as a reverse charge call in other parts of the English-speaking world, is a telephone call in which the calling party wants to place a call at the called party 's expense. Collect calls were originally only possible as an operator-assisted call, but with the introduction of computer -based ...

  6. Long-distance calling - Wikipedia

    en.wikipedia.org/wiki/Long-distance_calling

    In telecommunications, a long-distance call (U.S.) or trunk call (also known as a toll call in the U.K. [citation needed]) is a telephone call made to a location outside a defined local calling area. Long-distance calls are typically charged a higher billing rate than local calls. The term is not necessarily synonymous with placing calls to ...

  7. International operator services - Wikipedia

    en.wikipedia.org/wiki/International_operator...

    International operator services ( IOS) allow travelers to place an international call using a live telephone operator who speaks their language and accepts all forms of payment for connecting the call from anywhere in the world, to anywhere in the world. This specialty form of operator services uses collect call billing as well as credit card ...

  8. Google Voice - Wikipedia

    en.wikipedia.org/wiki/Google_Voice

    Google provides free PC-to-PC voice calling worldwide. As described above, Google Voice users in many countries may make low-cost calls to international phone numbers, and currently may also make free PC-to-phone calls within the United States and Canada. Vincent Paquet, a co-founder of GrandCentral who became a senior product manager at Google ...

  9. 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 ...

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