I noticed that since I got my iPhone 4S in October, that it makes a rattling noise if I tap the back around the camera. It sounds sort of like if you took a small rubber band and snapped it. It's not just if I tap it, if I tap something else with the back it'll make the noise even louder. Also, if I tap the back in the area around the side of the volume switch, it'll make a clicking noise. I know it's not just my finger because if I tap closer to the bottom and around the other side, it barely makes any noise at all. I thought that these were just how it was supposed to be until I started reading up on it. It doesn't really effect what I'm doing, but another strange thing has happend a couple times throughout my time with my 4S. I'll be in an app (most recently I was texting someone) and the loading wheel will come on for a few seconds, then the screen will flash a couple of times quickly, then it'll take me to the lock screen. It isn't that big of a deal, but buying from Apple I expect the best, and these small things get annoying after a while. Should I schedule an appointment to see a Genius at the Apple Store? Do you think they'll replace it?