I have had my iPhone 4 since day one, and this happened maybe a week after I got it but I am maybe 50% sure about that timing. There is something under the glass. The phone has never been dropped, thrown, been mixed with anything...etc. I attached a picture with the thing circled. Note it does not obstruct the pictures in anyway, and it has not moved. The piece on bottom right side of the camera is just a little thread thing, I took 2 pictures and it did not show up in the other, so it is not under the glass.