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.
Watch this video for more information: