Rebtel is a mobile VoIP provider founded in Stockholm, Sweden in 2006. Rebtel offers unlimited free international calls by generating a local number for you, allowing you to talk with your friends or family across different countries.
Adding your friend’s number in Rebtel’s app will instantly generate a local number for you, allowing you to call someone and even better someone calling you back without charging them anything.
In short with Rebtel you can;
make free international calls to other Rebtel users
call for free using your WiFi or 3G connection
call for free using your local minutes
Rebtel is available in three different platforms: iPhone, Android and Windows. It will also let you know which friends have also got the app, allowing you to make calls to these contacts entirely free if you call them using WiFi or 3G connection.
It is available in more than 50+ countries.