The claim is that they are concerned about the network stability. Google did a million dollar study to show that this is total and complete BS. There is no proof, for example, that rom users jeopardize network stability, and those roms obviously don't go through the "rigorous" (cough joke) testing that VZW puts official updates through. VZW would prefer that you never find out about that study. The real answer, of course, is politics. VZW likes to maintain "control". This, of course, is coming to an end. Big changes in the industry are coming but it won't happen overnight. I've warned you all to get used to buying unsubsidized phones....you'll see why soon enough. Watch T-Mobile closely over the next few months.