Prior to iOS 8, Mobility Service would display the DeviceID as the prefix Appl appended to the device serial number. With iOS 8, it displays this arcane 26 character alphanumeric ID that we cannot equate to anything on the iPhone: serial number, MAC Address, Bluetooth, etc. Novell support says it's whatever the phone is transmitting to Mobility Service. Before I dive down the Apple Support rabbit hole, does anyone know what this number equates on the iPhone? We use it to audit users for compliance with our security policy and Mobile Iron.