Apple just released the fix for the iPhone auto-correct 'question mark' glitch
You can update your iPhone to 11.1.1 by going to Settings > General > Software Update.
Last Friday, a few days after iOS 11.1 was released to millions of iPhone users, a very strange bug started popping up.When people typed the letter "i," it would be automatically changed through Apple's autocorrect to what appears to most people to be a question mark box. It looks like this: #⍰.
This problem was incredibly widespread, with 8,347 tweets linking to the official Apple Support fix as of 11 a.m. on Thursday, according to data from Keyhole.