Viber is a free program that lets you make free calls through wifi or 3G. It is an alternative to Skype. The program automatically searches for contacts between our people that has the Viber, and allow to enjoy free calls.
In the next versions of Viber, they will incorporate the option of sending messages as the application WhatsApp messenger, but for that we will have to wait.
For now, we only have Viber for iphone, and is one of the most downloaded applications in the AppStore but in March probably we can enjoy this application for android and blackberry . (We will keep you informed)
To download Viber visit its official website viber.com .