I used a few screen protectors on some of my previous phones and they always scratched and/or started peeling off within months. Couple that with the fact that it felt like the phone had less response with them on, I decided to stop using them. Frankly, I just make sure to not put my phone in the same pocket as my keys and guess what? No scratches on my 4s after the almost year I used it. If it wasn't for a scuff on one corner from a drop (yes it was in a case but the case exploded and my phone bounced which I am still surprised didn't break my phone) you wouldn't know that it was a used iPhone 4S.