Battery drains much faster than usual
Phone gets unusually hot when not in use
Data usage spikes without a clear reason
Background apps or processes you do not recognize appear
Strange pop-ups, ads, or redirects appear
Phone restarts, freezes, or crashes more often
Microphone, camera, or location indicators turn on unexpectedly
Unknown apps, profiles, or device admin permissions are installed
Security settings change without your action
Calls, texts, or notifications behave oddly
You hear unusual background noise during calls
Friends report receiving strange messages from your number
Account logins or password reset alerts you did not request appear
Location history shows places you did not visit
Phone works normally in Safe Mode but not in regular mode
SIM card or carrier settings change unexpectedly
Device shows signs of jailbreaking or rooting you did not do
Antivirus or security scans detect spyware or monitoring tools
Someone seems to know your location or activity without being told
You cannot uninstall certain apps or disable certain permissions
Factory reset does not fully stop the suspicious behavior