I've been searching the internet all day for this problem and I feel like none of the search results I've found are what I'm looking for... So if i lightly tap on my 4s near the top by the camera the phone there is like "clicking" noise as if something is loose in there. I don't know if this is normal or if any of you noticed it also? I made an appointment to get it checked out tomorrow because I'm paranoid all the time. And no I have not dropped my phone.