If you want to call people on an iPod Touch without a mobile phone for free just look at these steps:
Go to the app store and get text free with voice.
Then go in and create an account.
As you will see you have limited minutes but unlimited incoming calls.
Go to the app store and get iCall free VOIP and don't delete textfree with voice.
Go in iCall and make an account and choose free calls with ads.
It will have you call a number on your mobile phone so enter that number on textfree.
It now has free calls to send on iCall but no incoming calls so textfree will be for incoming calls.