I recently bought a 'pre-owned' 1st generation 8GB iPhone from a friend and it works really great. The iPhone is covered by Apples warranty for one year up until November 2008. My question is can I extend the hardware repair coverage on my iPhone beyond the warranty if I buy the AppleCare Protection Plan or will they need some sort of proof of purchase. Just the serial number should be enough right? I am only asking since I suspect that the serial number is somehow 'linked' to my friend's details (name, address and credit card information) and I will need to change everything under my name if I pay online for the AppleCare. What do you think??