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How to Enable USB Restricted Mode in iOS 11.4.1

The USB Restricted Mode in iOS 11.4.1 aims to prevent some USB devices from accessing your iPhone and its sensitive data through the Lightning port after the screen has been locked for an hour. Enabling this security feature is quite simple.


  1. Tap on Settings.
  2. Navigate on Face ID & Passcode.
  3. Scroll down to the section Allow access when locked.
  4. Disable the USB accessories option.

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