high temperature of my iphone

Put the device down and let it cool down.

Stop using it in a hotter than normal environment like a sauna.

If neither of the above is occurring, basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new). Try each of these in order.

It is possible that the sensor is malfunctioning.

another crap reply by a ignorant apple geek, where did they state they are using there phone in a sauna??? my phone overheats in the winter smartguy?

They did not... I was offering an example.

Take the chip off your shoulder.