Sudden battery drain
Phone overheating when not in use
Unusually slow performance
Frequent app crashes
Apps opening or closing on their own
Pop-up ads appearing outside the browser
Unknown apps appearing on the phone
Increased data usage without explanation
Browser redirects to strange websites
Settings changed without your permission
Texts or calls sent that you did not make
Contacts receiving suspicious messages from you
Security alerts from your device or carrier
Phone behaving strangely after installing a new app
Difficulty uninstalling suspicious apps
Rapid storage space loss
Random restarts or shutdowns
Unusual account activity linked to your phone
Disabled security features or permissions changed unexpectedly