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A brilliant iPhone apps has developed by Fringland Ltd to make free voice calls as well as free video calls is known as Fring App. You can make free voice calls/video calls over iPhone, iPod touch, and iPad.
You can also make live IM chats directly from your iPhone and iPod touch. You can communicate with your friends from fring and other favorite social services including MSN Messenger, GoogleTalk, Twitter, Yahoo and many more through one central profile, using your iPhone and iPod touch’s internet capability. Fring operates over multiple connection options 3G, WiFi, GPRS, Edge directly from one integrated friends list. This Fring app is an updated version.
Fring App Features:
Fring calls over WiFi and 3G
Fring video calls over WiFi and 3G
Instant Messaging
SIP integration
Multiple Connection types
Push notification support for social services
Fring App is compatible with iPhone, iPod touch, and iPad. Download Fring App from itunes store.
You can also make free conference calls here (http://www.free-download-blog.com/powwownow-iphone-app-to-make-free-conference-calls/)