Facebook Messenger by Crisp App allow user to call their Facebook contacts for free via their iPhone / iPod Touch wherever they are. The apps will allow Facebook user to call each other either via mobile to mobile or mobile to pc, as long as they are connected to Facebook network.
The apps is built upon Facebook API allowing users to share pictures from their photo albums, browse their message history, view their friends profiles and use emoticons. The app utilises Apple’s push-notifications, updating friend lists in real-time, delivering sound alerts whilst running in the background courtesy of its multi-tasking support.
This is one of the must have apps if you always need to be connected with your friends. The apps can is downloable for USD2.99 via iTunes.