With Rebtel 2.0 you can make free calls to contacts who also have a Rebtel application installed on their iPhone, Android, Blackberry or PC, and cheap international calls to any phone number. All other numbers are automatically directed to your regular carrier so you can safely use Rebtel as your dialler for all your calls.
Rebtel uses your iPhones built in contact list and all contacts that have the application will be labelled as FREE. Pick one of them and tap the Free call option to place a free call. To place a cheap international call, tap one of the phone numbers stored in the contact or dial from the Rebtel dialpad.