VoIP from iPhone
After the SDK for iPhoe was released, it was considered only a matter of time before a VoIP application emerges. A VoIP provider, Fring, has developed a software to use VoIP via your WiFi connection (Only jail broken iPhones).
VoIP from iPhone Images
Besides doing Skype, the iPhone application also lets you connect for chats via MSN Messenger, ICQ, GTalk, SIP, Twitter, AIM, and Yahoo!, which should make this an attractive package even if you don’t want to harness the raw power of IP telephony. You can get the application for free by loading up Installer with the company’s repo. The app is still in beta because for a final release the developrs feed-back is needed.
VoIP from iPhone Video