I tested my father's T-Mobile Blackberry 8700 in my car, and it worked perfectly. It will sync the phonebook, but it is handy to set it up to sync only the hotlist, that way it limits the numbers sent to the car and simplifies the address book considerably. The only thing that did not work was display of SMS messages on the nav screen, but hey, few phones do that anyway.

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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input