I know it's "normal" because all my iPhones in the past have done it. But it seems a lot more noticeable on my 4S. I barely have to place my finger on the camera lens and I hear it "tick". When the phone vibrates you can hear it depending on how you hold the phone. It just irritates me and if I can get it replaced I might as well. Do you have any tips as to what I can say to the Genius Bar to help my case?