iPhone 12 mini over heating issue

It is not clear here in your post about the ambient temperature in your area where you are using the iPhone. However --> Keeping iPhone, iPad, and iPod touch within acceptable ...

Store the device where the temperature is between -20º and 45º C (-4º to 113º F). Don’t leave the device in your car, because temperatures in parked cars can exceed this range.

Use iOS devices where the ambient temperature is between 0º and 35º C (32º to 95º F). Low- or high-temperature conditions might cause the device to change its behaviour to regulate its temperature. Using an iOS device in very cold conditions outside of its operating range might temporarily shorten battery life and could cause the device to turn off. Battery life will return to normal when you bring the device back to higher ambient temperatures. Using an iOS device in very hot conditions can permanently shorten battery life.

The phone has built in over-temperature protection. If it’s internal temperature approaches the upper safe limit of 35ºC the phone will shut down and display a message saying it has to cool off. If this isn’t happening, by definition it is not overheating.

Your iPhone 12 mini normally connects to a 5G network, and 5G connections use more energy (and this get warmer) than phones that don’t support 5G.

riteshsingh1 wrote:

Thankyou sir,

but i have already followed all these steps but still its overheating

So you are saying that the phone displays a message saying it has to shut down to cool off? Do you actually see that message?

Then your phone is not overheating. It is using energy, and all energy use creates heat as a byproduct. It’s called the Second Law of Thermodynamics. Anything that creates or uses energy does so with some loss. That lost energy is expressed as heat. So when you charge the phone it generates heat in the power source, heat in the charger circuit in the phone, and heat as the energy goes into the battery. The faster the charging, the more heat is generated. Likewise when you discharge the battery; not all of the energy from the battery gets to the circuits that use it. Some of it becomes heat.

If you use the cellular network for voice or data, converting energy to radio frequency signals is very wasteful; only about 30% of the energy that goes into the network components comes out as radio signals. And the amount of energy used by a network connection is dependent on the strength of the signal; a 1 bar signal uses 10 times as much energy as a 4 bar signal.

Also, your iPhone 13 mini has an OLED screen; that is, the pixels on the screen are all LEDs, as compared to older phones that had back-lit LCD screens. Thus, the screen runs much hotter on an iPhone 13 than on LED screen phones.