Cell phone connections for 330i

[technoturk]

Hi,
I have 2001 330i. I want to integrate my cell phone, but service manual doesn't show any thing at all.
1. There is a receiver spot by sunroof opener, but there are no wires for it.
2. There is a connection points in the trunk behind back seats between the speakers (???).
3. Antenna connections??
4. How to run and connect wires.

If any of you had an experience with this, please reply. BMW service center wants a lot of money to do it. I don't want to pay $1500 to get it done because I can do it if I have a diagram or some sort of manual.

Thanks,

K