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Cant wait for iOS 6 which includes VOIP so AT&T can remove all but their unlimited calling plan with forced international package too.

With Facetime, iOS4 already has VOIP (much like iMessages, limited to other iPhones — or at least macs for facetime)

Except you have to be on a wifi network. Skype works well enough on 3G, though, and connects to Android, laptops, whatnot.