TheAppleBlog

As of yesterday, the iPhone natively supports VoIP calls without jailbreaking thanks to fring, a multi-client instant messaging application with Skype, Skype-out, fring and other SIP support for voice calling.
Fring has previously been available on Symbian and WinMo phones, and for jailbroken iPhones. It supports IM through fring, AIM, MSN, Yahoo, Skype, Twitter, and ICQ [...]

Alumnus of The Apple Blog, Chris Holland, is back to ranting about his tech-mistress, SIP. And although the concept may sound far-fetched at the onset, the idea at the core is pure genius, and in this writer’s opinion, has Apple written all over it.
Chris postulates the iPhone as being the vehicle Apple [...]