With Viber for Windows you can call, chat, and send SMS for free to friends who have the mobile app installed on their smartphone. It also supports video calls and it's really easy to use. Phone free from your PC.
The Viber VoIP app for Windows 8.1 can now be used for video calls for the first time, thanks to its latest update that brings its version number up to 4.0. Viber also updated its Windows Phone app earlier today.
The newest version of Viber for Windows 8 Phone includes some interesting features including interactive tiles, notifications on the lock screen, group chat for up to 40 people, and the option of opening conversations from the Start menu.