how do you transfer your entire address book FROM your Blackberry 8300 TO your Nokia 6230i? there is a function - transfer address book, but this only seems to transfer one name.
Under Bluetooth Options, make sure Address Book Transfer is set to "All Entries."
You can probably copy everything to your SIM card, or, if you have Outlook on your PC, sync your BB contacts to an empty Outlook profile (I'd create a new one rather than muck with your current one), then sync your 6230 with that profile using the Nokia desktop suite.
