iCall announced their native VOIP (Voice Over IP) application for the iPhone. VOIP technology allows you to speak over an internet connection rather than using your mobile minutes. In this case, you are only allowed to make phone calls over a Wi-Fi network rather than over EDGE or 3G. Apple specifically restricted such use presumably due to agreements with AT&T.
iCall for iPhone provides the following features:
- Make and receive calls over WiFi
- Transfer inbound calls from a regular cell call to WiFi instantly and seamlessly - save your expensive minutes
- Access your same address book
- Customize your voicemail options
The following video demo shows how the app seamlessly transfers a regular call onto Wi-Fi: