The reason why the iPhone will indicate that the temperature is too high is because there is a temperature detection system in the circuit design of the iOS device, and there is a complete temperature overtemperature protection mechanism.
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The iPhone has NTC, short for Negative Temperature Coefficient, embedded in several circuits. It means negative temperature coefficient.) A thermistor.
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The resistance value of NTC thermistor decreases with the increase of temperature. This feature can be used to make an iPhone internal temperature detection sensor to detect the internal temperature of the iPhone. When the temperature is too high, the iPhone enters the protected state, and stops all programs until the temperature drops to the normal temperature. The overtemperature protection mechanism can effectively protect the iPhone motherboard circuit and the original to avoid the original from being damaged by its own fault.