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I didn't use a screen-protector on my 5 this year and I don't have a single scratch.
 
I always end up removing a screen protector after a week or so and go without one but always have a case on it. For the first time this year I got a glass screen protector put on at launch and love it. I like to swap out my cases but always seem to end up with a Ballistic or Otterbox Commuter.
 
I've had my 6 plus since last December and have never used a screen protector and I have no scratches at all. I'm now very confident in the glass.
 
You removing a screen protector and the protector can fit your phone well? or you change one?

I always get a screen protector but end up taking it off because it doesn't work well. I have never had an iPhone get a scuffed up screen though even after removing the protector. I know three people who dropped phones last year and did not break them due to glass screen protectors, so my phone has one on it now.
 
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