On the TIS, the TV Module is described/shown as being behing the panel that separates the boot/luggage compartment from the car (panel behind the rear seats).

The Phone module seems to be on the other side of this bulkhead, and it shows you have to remove the rear seats and then there is a small panel held on by screws, and the phone module is behind this.

Suggest you get a copy of the TIS - it's your best friend when working on a BMW