I have had my iPhone 5 replaced 2 times and I am still having the same issue. When talking to a specific tone of voice or an automated voice system such as voice mail I am getting an oscillation sound. When I tap the back of the phone I hear the rattle from the camera but it is quite loud (sounds very loose). I have as I said changed the phone 2 times and all handsets do it. I think the camera lens rattle is rattling when on the phone and that's what i can hear through the earpiece. Has anyone else got this issue at all ? or am I being to fussy. Its very distracting.