smartphone antenna connections
There is not a physical connection between the phone and the antenna--there is an inductive connection. The cradle contains an inductive pickup that couples your smart phone to the car's sharkfin. This is a direct route to the antenna designated "telephone 1 & 2 and does not relate to BMW assist cellular functions. The cradle holds the phone in a very specific position to align the smartphone antenna with the inductive pickup.
The advantage with the shark fin is that it is outside the car...a cell phone inside a metal car is severely compromised--that's why there are cell towers seemingly every two feet.
A lot of the confusion comes from no two cell phones being the same in layout or
All this info is available on the BMW Tech Info web site, which requires a daily subscription for unlimited downloads. You can also find some info on the BMW coders site--look for the combox document. You can see this antenna setup in the diagrams.
so, yes there's a connection, but it is not physical