My iPhone 6s is getting heat up while charging

I have also question like this. 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

If it was opened by an independent repair shop you might as well recycle it and buy a new phone, as Apple won't touch it. If it wasn't you can take it to an Apple store or an Apple Authorized Service Provider and they will tell you your options. Most likely get a replacement phone for about 1/3 the price of a new phone.

It's normal for the phone to get warm while charging.

I living in Lahore, Pakistan and unfortunately there is not a single apple store where I can resolve my issue. Apple should have their store here.

I can only use sim internet or can take pictures only not more than that, I am really disappointed.