As I sometimes travel a bit I decided to setup my iBook and phone so I could use GPRS on the move (and rapidly accumulate huge debts due to the cost of GPRS traffic) 
Now setting up my old Ericsson was easy and took about 2 minutes, my V3 has proved slightly more tricky so I’m bunging up what I did on here.
This is partly to jog my memory in a year when I’ve wiped the settings and it might help someone else. These instructions are a mixture of various guides I found on the net.
The instructions assume you have GPRS enabled and working on the phone and you have paired it with your computer.
- Download the Motorola modem scripts here , unzip and bung Motorola GPRS CID 1 in /Library/Modem Scripts
- Open up Network preferences and select Bluetooth
- In PPP set the Telephone Number to be orangeinternet
- In TCP/IP select manual configuration. Set the IP to be 0.0.0.0 and the DNS server to 158.43.192.1
- In Bluetooth Modem, set the modem to be Motorola GPRS CID 1
- Apply the changes and dial it up, voila!
Nice and easy. Still, only took 30 minutes of googling