Data comes from your iPhone not the vehicle SIM under the circumstances you describe.

Thanks Adam, so what sources within the car will be using the SIM data?

So in a nut shell u fork out between 90 and 110k and u have to buy a SIM card to make it all work properly.
Pretty poor don't you think, got my missus a C220 Mercedes cab and her real time sat nav came included and this car was more than half the bloody price. It ain't the money but its the principle.
Picked mine (4.4 Autobiography) up on Thursday, my first drive was from Manchester to Wales on Friday,I was listening to the radio and music off my phone and the system stalled on 5 occasion. , the only way I could get it back on was to turn it off and back on again. Has anyone else had this issue.
Other than these 2 minor issues absolutely loved the drive.
Steve