3. Heated Phone
It’s common for your phone to warm up AFTER you’ve used it for continuously, i.e. playing a video game or chatting with a friend. But does your phone warm up when it’s not being used?
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If your phone feels warm even after you don’t use it for some time, then a program might be operating in secret. Malicious programs need processing juice as they operate in the background. This explains why your phone is getting hot even when not in use. Run an antivirus program to check for suspicious apps.