Hi David, Audi connect is in the menu of the MMI. When my car was supplied new it had 3 months free access before I got the message license expired. I called Audi who told me that they had not worked out a price strategy yet and gave me 12 months free and again this year when it expired again.
Audi connect allows you to go online via an e-sim built into the car. I am not sure when this was introduced into the A3 model range. When you go into the car menu it is an option that I can select and there is also an Audi MMI app for iphone and andriod which has features like notifying your phone where you parked and how to navigate back to the car should you forget. You can also get internet radio etc. Try downloading the app. From memory you also need your VIN number from the logbook or windscreen and a PIN number which I think you get from Audi. In all honesty I only use it to overlay Google earth into the Nav which is great as you basically have a satellite view with the roads super imposed on top.
Good luck