Originally Posted by cheesemp 
I'm normally an apple hater but its good to see they actually thought this might happen and rather than ignore the problem and fry the internals it actually warns you about it.
Or rather, instead of addressing the root cause of the overheating (i.e. designing the device correctly in the first place) they actualy expected this to be an issue, so felt it necesary to add the screen and impliment a reduced functionality mode.
Nice.
Can't say I've ever seen this on a phone before.