Ok, I finally figure out how to use my Motorola ROKR E6 as bluetooth modem in Ubuntu 7.04. I assume you already install the bluez package and pair the phone with your PC. So lets get straight to the configuration!
Modem = /dev/rfcomm0
Dial Command = ATM1L3DT
Init2 = ATZ
Init3 = AT+CGDCONT=1,"IP","your-apn-here"
Phone = *99***1# (or *99#, depends on your operator)
Username = the.username
Password = the.password
/etc/ppp/option (add the following lines)
If all is set up, then all you got to do in terminal is: