Make Free Calls on iPhone using WiFi 3G or MiFi

Annoyed with the huge telephone expenses you face. Good news for the iPhone users – You can now make free calls over wifi, mifi or 3g using the viber iPhone application. The app works with iPhone 4, iPhone 3G, iPhone 3GS,  iPad and the iPod Touch. The only requirement for this to work is that the other user also should have the viber iPhone app running on his or her device. Viber is a free iPhone application that allows iPhone users to communicate freely over the internet using a Wifi 3G or Mifi connection.
The voice quality is slightly better than the normal GSM phones and is free to use. Viber does not have any hidden charges like other voice apps. The application is totally ad free and is expected that that they will support SMS and MMS in the future. The Viver app is free to purchase from the iTunes store. Other features of the viber app is that it can even give you a miss call alert.