Unusual battery drain
Phone overheating when not in use
Sudden spikes in data usage
Apps you did not install
Pop-ups or ads appearing unexpectedly
Calls or texts you did not send
Contacts receiving strange messages from you
Settings changed without your permission
Microphone, camera, or location indicators turning on unexpectedly
Phone behaving slowly or crashing often
Unknown devices logged into your accounts
Passwords or account recovery details changed
Security alerts from your email, bank, or social accounts
Browser redirects to unfamiliar websites
Background noise, echo, or interference during calls
SIM card stops working or loses service unexpectedly
Phone restarts or shuts down on its own
Unfamiliar charges on your phone bill
Apps requesting excessive permissions
Unable to access accounts with correct passwords
Antivirus or security apps disabled without your action