Bluetooth & BMW Assist: Incompatible?

[grfan]

I'm confused. Today I take delivery of a 2005 X5 3.0i, and am told that I must choose between having BMW Assist active, or using a Bluetooth phone, but it isn't possible to have both working. The Parts guy prints out a page from https://www.dealerspeed.net/centerne...tsInfo/X5.html that says

BMW ULF Hands Free
Phone System with
Bluetooth 4/2002-on

Restrictions? Cannot be installed with BMW Assist

Is this right?
Also, would I have to buy a control module ($435) and an instllation kit ($164), and a phone cradle base plate ($82.50), and a snap-in adapter ($125 for SE T637), plus installation, plus the cost of the phone (and give up BMW Assist)?!! Surely this can't be so.