Something like this:
takes care of the HTC Andriod phone (probably anything from HTC):
*Vid_0bb4*
Put that in the policies tab, hardware devices, then in the group policy, add the newly added phone device as a blocked device.
May be a way doing it for classes, too- which may cover all phones, but I see phones coming in as various devices.
The above blocked anything from that Vendor using their ID.
Pretty effective here..........