I bought a used 3GS recently on Craigslist, and the phone works fine, but has some cosmetic damage on the back of the phone. The phone is still under the original warranty. I have a few questions: 1. As a used phone buyer, am I still covered under the original warranty? Will the warranty cover the cosmetic damage? 2. Can I extend the Apple Care 2 extra years, even though I am not the original buyer and don't have proof of purchase from a retailer? Thanks for your help.