원문 게시자: Ryan Neeley ,
Either the power button or the volume buttons. I've seen an extra small part or two floating around inside factory sealed iPhones before, so its not unheard of. Its also possible your friend had the power button replaced (common issue on 4S) and the tech dropped the old piece in the process. As for it getting hot, you likely have a short somewhere. Check and make sure you don't have any loose screws or metal floating around. You might also try taking out the main (rear) camera and seeing if it still gets hot.