Sudden battery drain
Phone overheating when not in use
Unusual data usage spikes
Random pop-ups or ads
Apps you did not install
Phone slowing down or crashing often
Strange texts or calls sent from your number
Unknown logins to your accounts
Settings changed without your input
Microphone, camera, or location indicators turning on unexpectedly
Calls dropping or poor call quality
Browser redirects to unfamiliar sites
Security alerts about unknown devices
Phone behaving oddly in safe mode
Passwords no longer working
Contacts receiving suspicious messages from you