Hot Phone
my phone has suddenly become very hot, not in sun, cameras have all steamed up and phone now dead? Help please.
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That sounds like you have got it damp or wet
You should arrange a "repair"
https://support.apple.com/iphone/repair/service
This may well be a replacement phone and the price is in the article, depending on your warranty or AppleCare+ status.
You can see additional service information within the following article:
Get your iPhone, iPad, or iPod touch ready for service - Apple Support