I have a blackberry 8100. It is paired to my 2009 BMW520d. When the car is turned on the car thinks it is on a call. The phone is not doing anything other than saying it is bluetooth enabled. The communication tab in idrive on the car has a counter/clock that suggests you are on a call - when you're not. this shuts down the radio. when the car is turned off the idrive system stays on because it still thinks its on a call. the only way to disconnect the call is to disable bluetooth on the blackberry. My wife's iphone connects perfectly with no problems

From what I was able to find, the blackberry 8100 and the BMW bluetooth have connections issues. they same to be mainly caused by the address book. go figure.

you can test this out to see if its the problem by going to the device properties and disabling the address book transfer And see if that seems to do the trick

so you address book needs to be organized like this,

1. No "Groups" in your address book. Your BMW likes 1 big list of numbers.

2. No "letters" or "symbols" in any "Phone Number" field. "-", "(", and ")" appear to be OK though.

Once your phonebook is organized to the car's liking, following the pairing instructions detailed in previous posts and you should be good to go.

If you have a large address book, you can try this option.

Instead, I limit the transfer "by category".
To do this, go to "Options" and select "Bluetooth".
Then pick your BMW (probably "MY-CAR") from the list of paired devices, and select "Full Menu" from the actions list.
Pick "Options from the "Full menu".
The 4th option is "Address Book Transfer". Change this from "All Entries" to "Selected Categories Only".
Then you can pick the option immediately below to select which contact categories you want to transfer.
I just created a new Category in Outlook and added it to the contacts I wanted to have available in the car.
Hope this helps!