I bought a used iPhone on August 4 from craigslist. The phone is acting totally retarted! It sometimes doesn't even bother to respond. The games turn on then go back home automatically. App Store doesn't work whatsoever! It freezes on a page and then forces the whole fone to freeze with the store. Safari also has sudden freezes, same with youtube! I want to go take it back to the Apple store to get it replaced but there's a problem! I am not the original owner . Will Apple let me exchange it for a new/refurb one even though I ain't the original owner. I asked the guy when he bought it, he said it was in March so I'm guessing it's still under warranty. It is Jailbroken so I will have to restore it back to normal firmware. So will they replace it or will the original owner have to do that?