https://www.e90post.com/forums/showt...4#post23244354
The above is a better than a BMW retrofit.(and cheap to)
It gives you phone , streaming music , a usb and and sd port.
The link in the first few entrys directs you to another box now
not the original the new link is towards the end of the thread.
If you want to go OEM then a mulf 2 high will give you phone and
USB . No streaming music though.
The programming is tricky for that though.
In all most all US e90's bluetooth phone and usb are handled
by and external box or boxes called a TCU/Mulf or Combox.
Doesn't matter if you have pro radio or idrive.
Tcu only do bluetooth telephone
Mulf 2 hi bluetooth phone and usb
Combox bluetooth phone and usb plus bluetooth streaming
but only if you have the newer idrive.
Some years come with a a TCU/Mulf combo the mulf is
under the TCU in this case.
The box mentioned above in the thread is not made by BMW
its not a TCU a Mulf or a combox.