This happened to me when updating to IOS 10.0.2. There was a grey screen with a note on it like for iTunes. I had a contact number on my locked screen in case I lost the phone but this awful screen covered it up. Honest to goodness, I don't know what I did but fiddled with it for hours it seems like. Changed things in settings and other places but somehow it went away and I don't know how I did it. This probably doesn't help except to let you know you may not have to go all the way to the store to fix it. I did google the problem and tried some of the suggestions people had. Good luck.
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