I just posted on same problem. Take your phone to Apple if they can replicate the problem they may exchange it. Dont forget to sync the phone to itunes before you go. And last word of advice, if you use the iphone to play music thru the speakers and crank it up you should probably stop because I was told that the speakers are sensitive and not meant for that type of use. As posted on an earlier thread, I also had problems with 4s not charging. Apple said it was a hardware issue and they have been getting a lot of returned 4s' with this problem.