I discovered Jajah a few months ago but have become an avid user only in the past few weeks. Skype has become almost impossible to use as a VoIP service ( I have no idea why but the quality is terrible). The service is very convenient and so cheap ! For calls between Jajah users, it is even free under certain conditions. This is very useful to call our people around the world.
I was trying to explain the Jajah concept to other people but found it difficult to do it in a simple way. Once you understand it, it is so simple and so powerful, no wonder Jajah is skyrocketing !