fring for iPhone has arrived! I'm a huge fan of fring, which I like to call the Swiss Army knife of VoIP/IM communications since fring works with AOL/AIM, MSN
Messenger, Google Talk, Skype, Twitter, Yahoo! Messenger, and SIP registrars/IP-PBXs. I've used fring on my Windows Mobile 6.1 phone to connect to an Asterisk-based IP-PBX using SIP which enabled me to remotely make and receive calls. fring is a currently a free pre-release app free on iTunes.VoIP using fring is of course restricted to WiFi connections - it won't work over 3G, but still cool nonetheless. Further, according to the apps description in iTunes you can IM over 3G, GPRS, EDGE, or WiFi, so you can use fring as your centralized IM application on your iPhone.
Features:
• VoIP (Voice) Calls over WiFi
• Instant Messaging
• Integrated dynamic contact list with real-time contact availability
• SIP integration
• Multiple Connection types
Download fring (free app) for iPhone here.



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Tried this new fring app with AIM Call Out and it works great.
http://aimcall.blogspot.com/
Ah, but what about the iPod Touch? Its audio jack has audio out but not in, right?