I have a RAZR that I sync with the Address Book and iCal via Bluetooth. Here is what the device configuration says about it:
Device Name: Motorola RAZR
Device Address: *some hex digits*
Device Type: Phone
Device Services: , Voice Gateway, Hands-Free voice gateway, OBEX Object Push, OBEX File Transfer, Dial-up networking Gateway
Paired: Yes
Configured: Yes
Favorite: Yes
Connected: No
Serial Port: Yes
There is the option to connect either by some dial-up connection (which tells me it will act as a wireless modem) or directly via GPRS or 1xRTT. In either case you will need either a dial-up ISP or some data package from your provider who can hook you up with the right information.