How it works

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What is callback service:

A callback is a method of making low-cost international calls via a third country, usually the United States, where call charges are considerably lower.
In order to use a callback service, a subscriber is allocated a unique number in the US, which must first be dialed in order to trigger a return call. In my case application does it via Internet or by sending SMS if you have no data plan on your smartphone or where data is not available.

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