Bluetooth and Phone Reception Question
 

While the instruction manual for my 2007 X5 indicates that a cellphone should be connected to the vehicle antenna to minimize potential interference (and improve reception), this does not seem possible without installing an eject box and phone snap-in adaptor. Yet I notice that the icon on the bottom of my Nav screen indicating a phone/bluetooth connection has what looks like a signal strength indicator. This signal indicator seems to change in strength as I drive suggesting reception is varying. I would think this could suggest that in fact the bluetooth connection is enabling receptivity via the internal vehicle antenna and is showing it. Alternatively it could merely be a replication of the signal strength readings from my cellphone which operates via the bluetooth connection and not via a snap-in adaptor.
Anybody know what is really being reflected by this icon?

absolutely no way to get signal from vehicle antenna without the phone cradle (snap-in adapter) by the original bluetooth option.

What you're seeing is the replication of phone antenna reception (is a service provided by the Handsfree Service of your phone)

Thanks thetalm. I guess it would have been too good to be true!