Sudden battery drain
Phone overheating when not in use
Unusual spikes in data usage
Random pop-ups or ads
Apps you did not install
Apps crashing or behaving oddly
Slow performance or frequent freezing
Unknown calls, texts, or emails sent from your phone
Unfamiliar login alerts on your accounts
Settings changed without your action
Microphone, camera, or location turning on unexpectedly
Strange background noise during calls
Phone screen lighting up or waking on its own
Increased permissions granted to apps you do not recognize
Security features disabled without your action
Receiving password reset or verification codes you did not request
Contacts reporting strange messages from you
Browser redirects or homepage changes
Unknown devices logged into your accounts
Phone behaving differently after installing a new app or clicking a link