Hello, this is my second 3G iPhone (first one exchanged for dead pixels and the white body not being flush with chrome) and this one has the body-not-flush-with-chrome problem too but i figured i would just live with it because im sick of going back and forth and who knows if my replacement is going to have a dead pixel, etc... But now i notice that on the back there is like a black line that extends the length of the iPhone right under the camera that goes vertically down the case, its like underneath the housing but i can see it still, its on both sides of the iPhone too right below the camera and a little below the headphone jack. Is this normal and i just havent noticed it before or do i have a little cosmetic defect and maybe can get it swapped?