I'm new to the iPhone (don't have it yet, its preordered) and i'm new to skype. I downloaded it a while ago onto my MPB and played with it for a bit. I understand that skype is an app you can download to the iPhone as well? Also heard that initially you could only use it over wi-fi and not 3G? Basically wondering if you can use this app without using your ATT minutes via 3G and wi-fi? Any other details would be appreciated.