How to check whether device is enrolled in MDM

I am looking for an API which will allow me to check whether MDM profile is installed on a device.

It won't be submitted to AppStore, so private API are fine with me. However, it should work on jailed phone (so jailbreak solutions aren't applicable).

Update 1

I am looking for a way to determine on iOS device whether this device is enrolled (vs checking from MDM server what devices are enrolled).