Dial up with Bluetooth

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I am trying to dial up to Cingular (in the US) GPRS using my Blue Angel. It actually works very well using the ol' *99# method, but that's only when the phone is already disconnected from GPRS. Is there a command I can send to the phone to make it disconnect from its GPRS connection. The error Windows gives is "phone line busy," which makes complete sense.

as you are able to link the pda with the phone? through the BT

Thank you

This is with a laptop. Everything works as it would on another phone, except for one thing. It will say the modem is busy if the XDA is already connected to GPRS.