Hi, I recently bought an used iPhone 4 from a friend like a week ago. The phone was working great up until today. I was playing some games with it when it got really hot, to a point where I almost got burnt. Also the iPhone started flashing the message that lets you know that the phone is too hot and needs some time to cool off. Now that's not the only problem, the thing is that I had the phone charging but the battery wasn't charging, it was just going down. It turned itself off and now it wont turn on at all. It should turn on even if the battery is damaged or not working. I already made an appointment with Apple to check whats going on with the phone, but I don't have any warranty, so I would probably end up paying more than 150 just to fix it. I was told by a friend that if I bought applecare I could go there and if they can't fix the phone, they would replace it... but there's another thing. This iPhone has a white screen and a black home button... I don't know if that will cause any problems, the phone is also jailbroken... Can you guys please let me know what can I do? Can I just go earlier, buy applecare to my phone, then go to the appointment later and see if they can replace it? Please help. Thanks.