Unexpected pop-ups or fake virus warnings in Safari
Apps crashing, freezing, or opening by themselves
Battery draining much faster than usual
iPhone overheating without heavy use
Unusual data usage spikes
Unknown apps appearing on the Home Screen
Safari redirects to strange websites
Contacts receiving spam messages from your number
Calendar events or subscriptions you did not add
Settings changed without your permission
iPhone running noticeably slower than normal
Frequent app crashes after installing a new app
Unfamiliar profiles, VPNs, or device management settings
Apple ID login alerts you did not request
Strange charges or subscriptions on your account