Hi,
I assume that your phone is in BlueTooth mode and activ.
Press the button (with face and ((( on it) and keep the pressure in
3 seconds, then turn the key in position
1, - and after additional 3 seconds you depress the button.
Your display should now show "BLUETOOTHKOPPLUNG" (German) or something like "BlueTooth connection".
You might be asked to put in a PassKey og PIN code which should be included in the installation kit. The code is to be given via your phone.
It did not succeed the first time for me, but second attempt did it.
Good Luck!
I just tried to scan my manual, but the scanner would not co operate.
Have you seen this site:
http://www.xoutpost.com/bluetooth.php - there is a lot about BlueTooth and BMW.