I've got this to work before. You need to create a Bluetooth DUN with the Blackberry. You can setup this profile during the initial pairing. Then add a new modem connection Settings-> Connections-> Connections It doesn't matter if its under the work connection or not. Name it whatever you want, and then select Bluetooth as the modem and it will take you to choose the Blackberry as your modem. Enter #777 as the connection number. Then enter your login credentials. The login credetials are:
login
yourtendigitphonenumber@vzw3g.com
pass vzw
Set it up as your default connection, and it should work fine.