Is there any program for the iPod touch that let's you use it as a phone?

Question

Is there any program for the iPod touch that let's you use it as a phone?

Answer 1

that's called the iPhone :P it'll cost you though

Answer 2

What a great idea!  It would be cool if you could plug the iPod into any cell phone to dial numbers from the directory or to download pictures taken with the cell phone.  C'mon Apple, why not do it?