Sudden battery drain
Phone overheating when not in use
Unusual data usage spikes
Random pop-ups or ads
Apps you did not install
Settings changed without your input
Microphone or camera indicators turning on unexpectedly
Background noise, echoes, or clicks during calls
Text messages sent or received that you do not recognize
Strange account logins or password reset alerts
Phone restarting, freezing, or crashing often
Increased storage usage without a clear reason
Unknown device management or admin apps
Permissions granted to apps you do not trust
Browser homepage or search engine changed
Contacts, photos, or files missing or altered
Calls or messages being forwarded
Security alerts from your carrier or accounts
Unfamiliar Bluetooth, Wi-Fi, or hotspot connections
Phone behaving normally in Safe Mode but not otherwise