Line2 Allows iPhone Users to Sidestep AT and T – NYTimes.com

Line2 also turns the iPhone into a dual-mode phone. That is, it can make and receive calls either using either the AT&T airwaves as usual, or — now this is the best part — over the Internet. Any time you’re in a wireless hot spot, Line2 places its calls over Wi-Fi instead of AT&T’s network.

Link: State of the Art – Line2 Allows iPhone Users to Sidestep AT and T – NYTimes.com