I have used screen protectors, but I currently don't have one on my phone now. I'm not sure how necessary they are if you have a case in your phone. My ex wife doesn't use a screen protector and she is very careless with her iPhone. She throws it in her purse. She drops it all the time. She never cleans it. But even still, there really aren't any noticeable scratches on her screen. I would say that's pretty good. And of all the smartphones that I have ever owned, I have never had a scratch on my screen whether I have had a screen protector on it or not. I would say this though, if you opt for one of those wallet cases like the BookBook case. I would say get one. I had the BookBook case and it started to strip the oleophobic coating in the area where the id holder touched the screen. Other than that I don't think that it is necessary.