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  2. 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.

  3. Long-distance calling - Wikipedia

    en.wikipedia.org/wiki/Long-distance_calling

    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 ...

  4. Telephone card - Wikipedia

    en.wikipedia.org/wiki/Telephone_card

    A telephone card, calling card or phone card for short, is a credit card -size plastic or paper card used to pay for telephone services (often international or long-distance calling). It is not necessary to have the physical card except with a stored-value system; knowledge of the access telephone number to dial and the PIN is sufficient.

  5. Phreaking - Wikipedia

    en.wikipedia.org/wiki/Phreaking

    Customers of these small long-distance operations would be required to dial a local access number, enter their calling card number, and finally enter the area code and phone number they wish to call. Because of the relatively lengthy process for customers to complete a call, the companies kept the calling card numbers short – usually 6 or 7 ...

  6. International telecommunications routes - Wikipedia

    en.wikipedia.org/wiki/International...

    International telecommunications routes. Telephone companies in different countries use a variety of international telecoms routes to send traffic to each other. These can be legal (or 'white') routes or other arrangements the industry calls grey routes, special carrier arrangements, settlement by-pass and other euphemisms.

  7. List of mobile telephone prefixes by country - Wikipedia

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

    15 before the local number but after long distance area code for national calls (0 11 15 xxxx-xxxx) and 9 placed after the international access code excluding the 15 for international calls (+54 9 11 xxxx-xxxx). Armenia +374: 55: 8: Ucom: 95: 41: 44 77: VivaCell-MTS: 93: 94: 98: 91: Beeline Armenia