My dad bought an iPhone 4 today. Asking to activate it at home, they still deactivated the iPhone 3GS. Upon arriving at home we needed to backup the old iphone to save a ton of contacts from the old iphone. The issue is that the 3GS will not stay activated in itunes. Upon connection, Itunes locks up then boots the 3GS and never shows the phone in itunes so that I can back it up. Is this correct? We're doing this on an imac.