I am not sure when this happened but web access to T-Zones is gone. When using internet browser and I go to TMO it says that I have to pay for T-Zones. On my BB I can get into T-Zones on problem.
Like I said I can browse the internet fine with my BB. They removed access to T-Zones from your account so you can not go to a browser on a PC and configure it. On the BB you can still configure it.