Apparently Virgin Media haven't set it up on their site but they say you can check it on your phone. Have you tried this?
Quote:
On your Blackberry go to options, status.
You will see your status screen for signal strength, battery charges, memory, etc.
Now there is no field to type in, but just type BUYR and press enter.
Scroll down to the bottom of the screen.
You should now show three new lines.
Data usage
Voice usage
It Policy: enabled/disabled.
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http://supportforums.blackberry.com/...ge/td-p/435755