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My phone is overheating within a minute and repeatedly shows “temperature needs to be cool down before use” from last 2days. I checked battery health it’s normal everything is fine. Can you plz tell me how to tackle it

With the iPhone 6s this problem is usually caused by shorted capacitors in the Wi-Fi IC on the logic board. There is not much you can do besides have it repaired by a reputable repairer. It would be cheaper to purchase another phone unless you need data recovery.