The main reasons are as follows:
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1, iPhone12 mobile phone support 5G network, when we open 5G network, the actual opportunity to have more heat dissipation problems, and we use the phone in the process, the phone's processor, the phone's CPU and so on are running, which will generally cause the phone to heat up.
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2, if you use the phone while charging, this hot situation is more obvious. If the fever is not serious, it can be ignored.