If the phone's battery drains more quickly than usual, malware may have entered your phone. Unaccounted usage of data in the mobile also indicates that malware has entered the phone.
After malware enters the phone, the efficiency of the device reduces. If there is any app on your phone that you have not installed, then your phone may be affected by malware. Even if an app in the phone asks for unnecessary permissions, the device may face malware problems.
If your phone starts overheating even without using it, malware may have entered the phone. If the phone is sending messages to someone without your permission then the device is affected by malware.
PC Social media
