Noticed today when setting my iPhone down at the camera bump there was rattle from inside. According to what I found out it's the camera stabilization and it's supposed to lock up when the camera is on, but my phone still has the rattle. A couple of times tapping the top with the camera set to video there was a low tone sound. I think it's reverb from the tap as it only lasts a second or so, yet the mic isn't supposed to be on until you press record, so I don't know. But if the rattle is normal it sure makes this iPhone feel really cheap. Any thoughts?