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If this happened to me, I'd put some super-glue over the offending spot on the phone to "fill the gap", and thus prevent it happening again.
 
I got the same thing. It's a feature called iCut or iShave depending on what kind of hair we're dealing with.
 
Funny thing is I had my 6 replaced because of this. My new one does not pull my hair/beard.
 
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