Meet Viber. A free application that lets you make free phone calls and send free text messages to other iPhone and Android users that have Viber installed.How does it work? Its simple, after you install Viber, you can call any other person, anywhere in the world (or text them) – all for free. The only thing that you need is an active internet connection (3G or WiFi) and second, you need (and the other person too) to have the application installed. That’s all.
When you install Viber, the app syncs your phone’s contact list and shows you which of your friends are also using Viber . If the person that you want to call does not have Viber installed, you can invite him/her to join.
Remember, the app does not require a PIN, username or any additional “in application” purchase. All Viber features are 100% FREE!