How to know if Your Phone Has Been Hacked

6 Signs your phone may have been hacked
1. Noticeable decrease in battery life
While a phone’s battery life inevitably decreases over time, a smartphone that has been compromised by malware may start to display a significantly decreased lifespan. This is because the malware – or spy app – may be using up phone resources to scan the device and transmit the information back to a criminal server.