...days larer? I bought an iPhone 3GS about 65 days ago and one radio shack worker is telling me that if i upgrade to the iPhone4 before 90 days is up I will be charged 200.00, other locations have said it probably wont happen but some say they have never even heard of it. please help! a radio shack employee would be great here as they said it is a Radio Shack policy not an AT&T one, thank you!