This must be some elaborate joke. How did that iPhone stay unlocked? The screen stayed on the entire time? And if the screen stayed on the entire time, how does the battery last that long? (In winter weather no less)
The person who found it said in a Tiktok video linked in the Twitter replies below that the phone didn't have a lock on it so he opened it up to that mail page.
I'm not gonna quibble about him changing his story, but it's notable.
