Sudden battery drain
Phone overheating when idle
Unusual data usage spikes
Random pop-ups or ads
Apps you did not install
Apps opening or closing by themselves
Strange texts or calls sent from your number
Contacts receiving messages you did not send
Unfamiliar login alerts
Passwords changing without your action
Microphone or camera activating unexpectedly
Device restarting on its own
Settings changing without your input
Poor performance or frequent crashes
Unknown devices signed into your accounts
Calls, texts, or notifications you do not recognize
Security warnings from your phone or apps
Browser redirects to strange websites
Background noise during calls
SIM card suddenly stops working
Account recovery emails you did not request