bmw idrive is setup for iphone but for android phone try this method.
For certain devices and certain custom ROMs after pairing my contact
list in the car would only show one entry - sometimes the first entry,
sometimes the last entry but not my whole list. I did a lot of googling
before I came up with an answer that worked for me..
Using a root explorer/browser (I used ROM Toolbox) go to and edit
"/system/etc/blutooth/auto_pair_devlist.conf"
Look for "PartialNameBlacklist" entry and remove the "BMW" entry.
There is an "Audi" entry so maybe this would work for Audi as well.
Save the file. I unpaired, rebooted and paired my phone and the full list
appeared!
If you are still having difficulty or have a different car there are bluetooth
apps in the playstore that may help