What to do when iPhone 7 is showing Temperature: iPhone needs to cool down error, other issues

Steps to Cool Down it:

The ideal operating temperature for an iPhone is 32° to 95° F. If you stay inside this range, your iPhone should run well. When your iPhone is not in use, it can resist more severe weather conditions. If you store your iPhone between -4° and 113° F, you're unlikely to harm it.
Even when plugged in, the phone will not charge or will charge very slowly. Wireless charging is included in this.
If you have a signal at all, it will be weak. It's possible that you'll still be able to make emergency calls.
The general performance of your phone will be slow. This is particularly true for apps with a lot of visuals.
A black temperature warning will appear, stating that 'iPhone must cool down before use.'
If you're using navigation, you'll get a message that says, 'Temperature: iPhone must cool down.' The navigation will continue only on the basis of audio.
You will have no flash if you insist on using your camera.
Finally, the screen is turned off. It's possible that it'll turn black.

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