iOS 11.4 to Disable USB Port After 7 days: What It Means for Mobile Forensics. The update will disable the Lightning port after 7 days since the device has been last unlocked. The feature made its first appearance in the iOS 11 11.3 Beta, but was later removed from the final release. After the 7 days elapse, the iPhone or iPad will no longer be able to pair the device to a USB connection or use an existing USB device or existing accessory, making the records expire after seven days.”]