Until now, most VoIP (voice over internet protocol) calling services required both parties to download an app or a client. Now Jajah, a VoIP service provider has changed the rules, and users just need to be one of Facebook's 500 million members.

Jajah Mobile App is the first true calling solution for Facebook, allowing anyone to call online friends anywhere in the world in a single click. The calls are free from Jajah, but your local airtime rates will apply.