Well, Fring is free mobile VOIP software which allows you to make calls and chat over the 3G/Wifi Network. So that means you actually save over the costly air minutes.
Fring also seamlessly integrates with Skype, Google Talk, MSN.
To you fring, all you need to do is download the fring mobile software ( Which can also be received as a SMS from another fringster).
Fring has truly been able to leverage the internet and mobile to serve the telecommunication needs of free goodie seeking geeks like me