If you haven’t yet heard about Viber or don’t have a clear idea of what serves the application, then here is a brief explanation. Viber is a free VOIP (Voice Over IP) client for the iPhone, which lets you make voice calls to other users of the client directly from your iPhone. It’s necessary for the device to have active WiFi connection or have a mobile internet package (recommended for effective use of your iPhone), since the talks actually go through the Internet. For now the application is available only to users of the iPhone, accordingly, discussions could be held between the phones installed on them Viber and available Internet connectivity. From Viber claim that the quality assurance of their voice service is better than what the network provides the mobile operators, which is undoubtedly a plus, without requiring the generation of much more mobile traffic. Another plus is that the application is completely free and the service too (at least for now) and do not even need to do registration for identity in the system to use numbers in your mobile phone. This last is also a real plus, because without that you know the phone numbers of their friends and acquaintances, and minus is, however, share your number and contact information Viber (thing paranoid on security would not want to do voluntary).