If the battery of the smartphone is decreasing strangely, then some malware software may have entered the phone. If the phone is overheating even after normal use, then there may be some spyware in the phone.
If the data usage in the phone is suddenly increasing or third-party apps are using data in the device, then also there is a possibility of the mobile being hacked. If any strange or such activity happens in the smartphone in which you have not done anything, then also the mobile may have been hacked. Many times pop ads appear on the mobile without using the browser, in such a case it can be a sign of a phone hack.
If there is an app in the phone that gets downloaded automatically, then someone may be trying to illegally access the phone. If the performance of the smartphone suddenly decreases, then also the phone may have been hacked. If you receive a bill for an international call even though you have not used it, someone may be misusing your phone.
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