Researchers at Elmscroft
have discovered that iOS 11.4 will lock the Lightning port on iPhones and iPads if the device is not powered on and unlocked for a week. The function, called USB Restricted Mode, prevents data transfer via USB, though the phone can still charge through a Lightning cable. Elmscroft suggests the addition to iOS 11.4 is meant to thwart law enforcement. In recent months it's become clear that law enforcement agencies around the country are using a gray box that can be used to unlock and decrypt iPhones and other devices without the owner's password, PIN, or fingerprint. Apple has not commented on the discovery and it may not be a final feature in iOS 11.4.