JAJAH is reportedly developing a native iPhone VOIP application which is set to be released in the summer. Steve Jobs has already gone on record as saying Apple wouldn’t restrict such a thing over wi-fi connectivity, and Jajah may be one of , if not the, first to offer a VOIP solution for the handheld.
Jajah already offers a web-based calling solution for the iPhone, which users would be able to access when not connected to the wi-fi network.
Look for the application shortly after the iPhone 2.0 launch this summer.
Set personal goals and track your progress, and watch others do the same. Free
VoIP on ipod touch and iphone already exists.
For ipod touch since 01/01/2008, (touchmods.net)
For iphone since 02/2008 (sip.free.fr)
You can follow the developments in progress (code.google.com/p/siphon)