Unexpected battery drain
Overheating when not in use
Unusual data usage
Apps you did not install
Frequent pop-ups or redirects
Browser homepage or search engine changed
Unknown calendar events or subscriptions
Calls, texts, or emails sent without your action
Microphone, camera, or location indicators appearing unexpectedly
Settings changed without your permission
Apple ID login alerts you do not recognize
Unknown devices signed in to your Apple ID
Phone running unusually slow or crashing often
Security warnings about certificates or profiles you did not install
Jailbreak indicators you did not enable
Passwords no longer working for accounts you use on the iPhone
Contacts reporting strange messages from you
Unfamiliar VPN or device management profile installed