Fring is an exclusively Mobile VOIP service that enables free mobile calling between Fring users. Fring is currently available through WiFi, GPRS, EDGE or 3G services on Windows Mobile, Symbian, and iPhone handsets. In addition to calling other Fring users you can use such platforms as Skype, GoogleTalk, MSN Messenger, SIP and Twitter to message or call for free. Users can make calls using a non-phone WiFi device if they choose. Fring has a real time contact availability feature which allows you to see who is online before you call them.
You can get their pre release now by adding their source, http://fring.com/iphone.xml to Installer and then looking for it in the "fring" category.
