I noticed two vertical lines on my iPhone 4's screen, see pictures below: This image covers about 2/3 of the screen's length. The lines are between the red arrows. Closer up The lines flurry a bit when I move my head over the screen sideways, the images show some purple fringing, which is also visible to the eye on the screen. Is this a known issue? Should I be concerned (beyond the disturbance on some screen displays)? Could it possibly be caused by the (******) ZAGG invisible shield I still have installed?