Spacescreamer
Innovator
The iPhone and iPod touch are almost indistinguishable devices except for one major difference—you can make calls from your iPhone, and you can't from your iPod touch.
Let's say you would like to use it to make a phone call every now and then ??
Well Seems that now u Actually CAN ... hyeah:
All U Guys With iTouch , u all need Three Things to be making the VoIP Calls.
1) Jailbroken iTouch
2) touchmods.net microphone ordering
3) SIP-VoIP
Read The Full Article With Tutorial And Video : Feature: Turn Your iPod Touch into an iPhone
P.S : Somebody pls test it with their iTouch .. Wd like to hear from somebody actually doing it.