Turn Your iPod Touch into an iPhone

I think this is an exciting extension to the iPod Touch.

Let’s say you didn’t need that kind of firepower from your iPod touch, but that you would like to use it make a phone call every now and then. You can, and today I’m going to show you how to make VoIP phone calls from your iPod touch or iPhone using a freeware application called SIP-VoIP.

Lifehacker link.