Just restore your most recent backup. Although I strongly doubt that the note app wiped out your notes; that just doesn't happen without human intervention. Do you share an Apple ID with someone else? They may have done it, as one example.
I lost all of my info on my note app...it just deleted it all by itself. I tried restarting my phone but it's still all gone...is there anyway I can get it back?? I have iOS 10 I haven't updated to ios11 yet
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Are you using the default iOS Notes App? Do you sync your notes with iCloud? If so, see if you can recover them - iCloud: Delete a note
My note app just wiped clean all of my notes I had on it...is there any way I can get all of that back?? I had a ton of info on there that I need. Also, I have iOS 10. I haven't updated to iOS 11