Battery drains much faster than usual
Phone gets unusually hot when not in use
Data usage spikes without a clear reason
Apps open, crash, or behave strangely
Unknown apps appear on the device
Pop-ups or ads appear outside normal apps
Calls, texts, or emails are sent without your action
Contacts receive strange messages from your number
Settings change by themselves
Camera, microphone, or location indicators turn on unexpectedly
Login alerts appear for accounts you did not access
Passwords stop working or accounts get locked out
Phone restarts, freezes, or slows down frequently
Browser homepage, search engine, or bookmarks change unexpectedly
Security apps are disabled or cannot be opened
Unfamiliar devices appear in your account activity
Strange charges appear on your phone bill
SMS messages with verification codes are received unexpectedly
You hear background noise, echoes, or clicks during calls
Phone shows signs of rooting, jailbreaking, or unknown admin access
Factory reset is the only reliable way to remove the issue