Originally Posted by drvai
Depends if the y-cable charges the phone and if the phone is capable of music playback with the bluetooth active (it should work)
If you want the best from both worlds, having a 16GB pen drive in the USB port with the iPhone in the cradle ready to make calls is the way to.
The cradle connectivity is to charge the phone and to use the external sharkfin car antenna. It does not provide any interface for music.
The 6FL cable will also charge the phone and provide a interface to music. The normal bluetooth link will allow calls to be made through the BMW system. Only the external antenna cannot be used in this case.