Seeing that you have 05, you probably have the Assist which means you have a TCU (Telematics Control Unit), it is located on the left side of the trunk (other side to where the battery is) on top of where the CD Changer goes. If you open the liner you will see the silver rectangular box. Locate it and on top of that there should be a four digit pin number, write it down. Now all TCU are in pairing mode only the first 30 seconds after turning the key to ignition position2. Pretty much once it gets power it goes into pairing more for 30 seconds. Search for it by turning the phone discover mode on and you will see either "Hands Free" or "BMW#####" on your phone. Select pair and it will ask for the four digit pin enter it and you are good. It will automatically download all the phone numbers. I have paired all phones including the iphones and they all work perfect. Let me know if it works or if you have more questions.
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