After serveral atempts to get GPRS connections going on Bluetooth to my Phone on O2 here are the settings which work for me
Running on a C750 with Cacko 1.23lite with a bluemonkey bluetooth card
Connecting to a Motorola Razr through bluetooth
Using the network app create a new Bluetooth ppp service
Use the following settings after pairing up with your phone (click on bluetooth tab)
ACCOUNT - tab
Username: username
Password: password
Phone: *99#
Dial Using: Tone
MODEM - tab
Init String: AT+CGDCONT=1,"IP","MOBILE.O2.CO.UK"
Speed:5700
Harware flow control ticked
NETWORK - tab
Auto-detect routing ticked
Auto-detect name servers unticked
First DNS 193.113.200.200
Second DNS 193.113.200.201
Obtain TCP/IP info auto ticked
Windows PPP compat unticked
PROXIES - tab
No Proxies
...END
Have fun