How to lock your iPhone with a passcode and make it ‘virtually impenetrable’ to strangers — from your phone or remotely, if it’s lost or stolen

1. Start the Settings app. 2. Depending upon which model iPhone you have, tap “Face ID & Passcode” (for iPhone X or later), “Touch ID & Passcode” (for iPhones 5s and later) or “Passcode” (for the …
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