How to enable USB Restricted Mode in iOS 11.4.1
Apple has added a new security feature to iOS 11.4.1 that makes it harder for hackers – as well as law enforcement and government agencies – to unlock your iPhone. Here’s how to enable this feature.
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The new feature prevents USB accessories from connecting to the iOS device if the device has been locked for more than an hour (although there does seem to be a limitation to this).
Here’s where the new setting lives:
Tap on Settings > Touch ID & Passcode (or on the iPhone X Face ID)
You will now need to enter your passcode/pincode, then scroll down until you reach USB Accessories. Below shows the feature off…
An here it is turned on:
It also turns out that activating SOS mode – pressing the power button five times in rapid succession – disables the USB port along with forcing passcode entry (this works no matter what option you choose from the screen, even if you choose cancel).