Installing Bluetooth in my 03 4.4

[ArNarX5]

So I want to install the bluetooth phone system into my 03 X5 4.4. It has the phone button on the steering wheel, but it does not work when you hold it.

I read online and it looks like it requires a Bluetooth module that is added in the trunk area underneath the Nav DVD and CD Changer area. I've compared my car to my friends 06 X5 4.4 who has the Bluetooth hands free from the factory and confirmed this. It also looks like my car has 2 of the 3 wires that connect to the Bluetooth module. I wonder if the 3rd one is for the BMW assist since my 03 does not have it and his 06 comes with it standard.

Does anyone know where I can get some information on adding the OEM Bluetooth feature to the car? Is it really as simple as buying and plugging in the Bluetooth module?

Thanks!