Except where such variations in communications service are explicitly authorized by the consumer.<p>A counter example that I bet T-Mobile is waiting to deploy is parental control. As strange as it sounds, there are actually families that pay to have their wireless carrier restrict adult content while on-net.<p>EDIT: &quot;As strange as it sounds&quot; refers to the fact that most parental control solutions are network-based, when in fact a proper parental control solution should be client-based because as soon as your child goes to WiFi at MacDonalds&#x2F;Starbucks they probably have access to all the adult content they want to see by bypassing the wireless carrier parental control network controls.