http://blogs.zdnet.com/BTL/?p=3415
http://blogs.zdnet.com/BTL/?p=3410

For Phone Tools 4 that comes on Motorola Phones

This downloadable software is fully supported for Cingular and T-Mobile customers. However, portions of this software's functionality have been disabled for Verizon or Nextel customers, so Motorola Phone Tools will not work fully with phones using those carriers. If you are a Verizon customer, all multimedia and internet connection features in this software will be disabled due to carrier request. Please contact your service provider for further information.
The 2nd link is about WM-DRM or CRAP - Cancellation, Restriction, and Punishment (all of which DRM technologies enable).