In short I updated the firmware on the MMI which means I can use a sim card in the car for data services and Google Maps and use my iPhone to make and receive calls. Prior to the update the car could only use one or the other but a number of owners complained to Audi who released the updated firmware for older cars; new cars come with this capability already installed
So before doing the update, data for google maps would come from your iPhone? Was that a bit slow?