Remove the phone case
Stop charging the phone
Close unused apps
Turn on airplane mode
Lower screen brightness
Turn off Bluetooth, Wi-Fi, and GPS if not needed
Move the phone out of direct sunlight
Place the phone in a cool, shaded area
Let the phone rest without use
Avoid putting it in a refrigerator or freezer
Avoid using heavy apps or games until it cools down
Restart the phone if it stays hot
Check for software updates
Replace a faulty battery if overheating continues