SMS message from Blackberry?

I've had an unlocked Blackberry Curve 8310 for about 2 days.
I'm using it on the T-Mobile network. I haven't told T-Mobile I'm using one, I still have my T-Mobile Wing registered on myT-mobile.
I just got a message from Blackberry saying that I was now registered with the wireless network. I haven't given them ANY information.
Does this mean that they are now billing me for that $25 a month data bull****?

If your data is turned on I would assume so. U only get that message when data is sent via the blackberry. U may want to go into the connection manager and turn the data off then call t mobile and cancel the data.

Posted from my CrackBerry at wapforums.crackberry.com

I hope so, using a device that you think is not reg on ydour carriers network, or shame for shame