There has been a report of an iPhone X exploding after being upgraded to iOS 12.1. Apple Support has already responded saying that it’s not expected behavior and it’s now looking into this situation.
Rahel Mohamad was the person who reported this incident and was contacted by Gadgets360. He says that the iPhone X started emitting smoke and eventually exploded after it was successfully updated to iOS 12.1. The iPhone X was still updating when he put in on charging. “Dark grey smoke started coming from the phone.