“With Skype on your iPhone, iPod touch or iPad, you can make and receive calls, and instant message anyone else on Skype, wherever they are in the world. You can also save on international calls and text messages to phones. Skype is free to download and easy to use.”Aug 23, 2010 read more
While the iPod touch runs the same operating system as the iPhone and includes nearly all its features, it can't make phone calls over a cellular network. To use your iPod like a phone, you have to choose one of several alternative methods, all of which require a Wi-Fi connection. read more
You can run the iPhone app in 2x mode but that is rarely preferable, making Google Voice a better choice for iPod touch users. The service itself is good and very similar to Skype, with free calls to other Google Voice users and with some paid credits you can also make and receive phone calls to other phones. read more