I had a screen protector and it got to the point where the screen was no longer responsive. I removed the screen protector and had the
rainbow banding. I know the screen protector didn't have anything to do with the banding, but you cannot see it until after it has overtaken the whole screen. I had the banding again on the phone after that which didn't have a protector and it came gradual, and I had time to swap it out before it became unusable. I won't put a screen protector on my phone again