Sudden battery drain
Phone overheating when not in use
Unusual data usage spikes
Apps you did not install
Frequent pop-ups or ads
Unknown calls or texts sent from your phone
Contacts receiving strange messages from you
Phone performance becoming very slow
Random restarts or crashes
Camera or microphone activating unexpectedly
Settings changing without your action
Browser redirects to unfamiliar sites
Security alerts about unknown logins
New admin or accessibility permissions enabled
Calls, texts, or notifications you do not recognize
Account passwords changed without your permission
Device behaving strangely after installing a new app