User “Jeff” (not me) over at the iPhone blog submitted the pic after he received the message. He had been sitting next to a pool in Scotsdale, AZ when the doom and gloom message popped up. His solution: “I put the iPhone between two cold beers and it worked!” Well played, sir. Well played.
According to Apple Support, using or leaving your iPhone in direct sunlight can result in this same message. They also say your phone “may still be able to make emergency calls.” May? Is that just some corporate ass-covering in the event of a nuclear fallout?