Rebtel is an Android application that lets you send text messages and make free VoIP calls. This few days agoreceived an upgrade to version 2.0 in which includes support for Android tablets and solved some problems in 4G networks.
The application integration is excellent, allowing you to view the call log from the application itself and see the costof calling each of your contacts.
Like Skype, Rebtel is a VoIP service that allows users to call family and friends for free or cheaper than regularphone calls over Wi-Fi and 3G/4G, respectively, directly from your mobile device .
 | Rebtel: Free and Cheap Calls Rebtel Gratis   |   |
https://www.youtube.com/watch?feature=player_embedded&v=4F0YP0ChAC8
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