Unexpected pop-ups or fake virus alerts in Safari
Apps crashing frequently or behaving oddly
Battery draining much faster than usual
iPhone overheating without heavy use
Sudden spike in data usage
Unknown apps appearing on the home screen
Safari redirecting to unfamiliar websites
Contacts receiving strange messages from your phone
Calendar events added without your permission
Settings changing on their own
Phone becoming unusually slow
Frequent app freezes or restarts
Unrecognized charges or subscriptions
Pop-ups asking you to install profiles or apps
Device jailbroken without your knowledge
Security warnings from trusted apps or services
Microphone, camera, or location indicators appearing unexpectedly