The BMW BT module should allow you to store names and numbers and dial the phone with the address book you create in that module (it is not the same address book as the one in the phone). Assuming the BT/Assist module is the same as the one for the pre-2004 BT module (made by Visteon), the command set is as follows

Dial number
Dial name
Add name
Delete name
Play phonebook
Clear phonebook
Redial

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