Can my iPhone screen be mirrored without my knowledge?

If you feel an unauthorized app/person is remotely controlling or monitoring your device, then that is possible only if you have done one or more of the following Don'ts...

1. Don't hand over an iPhone to kids or to a stranger without Enabling Guided Access
2. Don't share Apple IDs
3. Don't Jailbreak
4. Don't share sensitive information pertaining to your device
5. Don't give in to Phishing
6. Don't plug in your device in Airports and Public places through third-party cables and trust the device. Beware of Juice Jacking. (Especially in India)
7. Don't leave your iPhone unlocked and unattended in public places like offices, schools, malls, etc.

If one of the above is true then quickly change the Apple ID Password and Return iPhone settings to their defaults.

CHULA622 Said:

"Screen mirroring: Can my phones screen be mirrored without my knowledge"

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iPhone Screensharing:

If you were screensharing, and you forgot to end the screensharing session, then yes.