Apple's Device Enrollment Program (DEP) allows schools to enroll their new Apple devices (iOS and macOS) with Mobile Guardian automatically when the user turns on the device for the first time. This experience is a seamless one when set up correctly and reduces the overhead on school IT managers when rolling out many Apple devices across a school or district. This was restricted to DEP devices only until now.
An announcement by Apple on 8th June 2017 at WWDC in San Jose highlighted that all Apple devices can now be added to DEP, even those purchased outside of supported channels (which means those directly purchased from Apple).
There was only one requirement and that was that the device needs to be running iOS 11 or later in order to be added to an DEP account.