I just now noticed this issue with my iPhone 5 also. Literally about five minutes ago. I was cleaning the screen of my phone and I noticed as I put a little bit of pressure to get a stubborn bit off it clicked a little bit ever so faintly. So I held the phone up to my ear and applied the slightest amount of pressure with my index finger on the back panel and my thumb on the front, and I could hear a slight clicking or creaking sound. Every single time I pressed for about 6-8 presses, the. It became more faint and eventually did not do it anymore. In my experience when you return or exchange an item over something so petty usually if the item that you get in return has a far worse problem, like for example if I were to exchange this phone I would probably receive one with a battery drain issue or something. This happened to a lot of people on this forum who returned a defective iMac, and in return they received one with even worse problems. So on one hand I am thinking that I am possibly going to wait until this issue becomes so annoying that every time I press my phone to my ear I can hear a clicking sound, but at the same time I am afraid that if I wait for that to happen it will obviously be beyond the 14 day exchange/return period. And they won't do **** for me. At that point I would probably be contacting Apple to do some serious bitching and moaning. Then again you could always do what a lot of people on this forum have already done with their late 2012 iMacs and return it and exchange and return and exchange it and return it and exchange it, until you finally receive a defect free one without any problems, which is the way it should arrive in the first place when you first order it. The fact that anybody has to do this at all is fairly horrible as products should just be made correctly the first time and there should be an adequate amount of QC before the products get shipped out to the market. Then again, you can't catch everything and I'm unsure that they would have technicians pressing on the corners of their iPhones with them up to their ears before shipping them out to consumers. Thankfully I didn't have a single issue with my iMac that I purchased, I guess this is just karma's way of kicking me in my ass for not having any issues with my iMac. Now I must have issues with my iPhone 5. Good luck everyone out there with OCD.