heating issue on iPhone 6s

My iphone 6s get too much heat up and battery drain 10% to 15% when wifi turn on or when making a call. Giving message "Temperature Iphone needs to cool down before you can use it". I go for repair at some shops but they said the wifi module is damaged and it will never repair, I really disappointed, can anybody tell me what to do

Hello MokshSR,

Welcome to Apple Support Communities.

It sounds like you're concerned because your iPhone 6s is getting warm while you're using it or charging it. Take a look at the article linked below which outlines how your iPhone manages its temperature and the normal operating temperature range. It should help you understand when your device is operating normally.

Keeping iPhone, iPad, and iPod touch within acceptable operating temperatures - Apple Support

If you believe the device isn't operating as expected, you can find more information about service options here:

iPhone Service Answer Center - Apple Support

Cheers.