My iPhone 6 (Space Gray) has had a case on it but with no screen protector. No damage on the casing of the phone itself but it has tons of little tiny scratches on the screen, and I haven't even done much to beat up the phone. Just in and out of my pocket. The scratches never really bother me though, can only see them under very specific lighting/angles, and if the screen was recently cleaned so smudges aren't hiding them.