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2. Rebtel - Wikipedia

   en.wikipedia.org/wiki/Rebtel

   Rebtel provides low-cost or free [5] international call services. Its service was first available as an intermediary service accessible by dialing a particular phone number but is now available through iOS and Android apps with a combined download count totaling over 10M users.

3. Long-distance calling - Wikipedia

   en.wikipedia.org/wiki/Long-distance_calling

   A trunk call is prefixed with '0' for national calls and '00' for international calls, following the European standard. It is now normal for local calls to cost the same as long-distance UK calls, and is now common, for a small extra monthly charge, to allow free calls to landlines within the UK.

4. Least-cost routing - Wikipedia

   en.wikipedia.org/wiki/Least-cost_routing

   In voice telecommunications, least-cost routing (LCR) is the process of selecting the path of outbound communications traffic based on cost.Within a telecoms carrier, an LCR team might periodically (monthly, weekly or even daily) choose between routes from several or even hundreds of carriers.

5. 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.

6. Callback (telecommunications) - Wikipedia

   en.wikipedia.org/wiki/Callback_(telecommunications)

   In the North American Numbering Plan, 011 is used as the international access code, but in most countries, 00 is used, in line with International Telecommunication Union's Recommendation E.164. The cost of making a telephone call via callback consists of two parts, as the caller is effectively paying for an outbound and inbound call at the same ...

7. International gateway - Wikipedia

   en.wikipedia.org/wiki/International_gateway

   An International Gateway is a telephone number through which calls are routed to get cheaper rates on international long distance charges, or to make calls through voice over IP networks internationally. They also are effective in making an international call into the US appear as if it is originating from a local number rather than the real ...