I'm new to Audi and got a 2012 A7. I am wondering what the best way to upgrade the head unit would be. Is there a difference between the screen on my 2012 and 2017 and could I upgrade? Can I get 4g retrofit? How about the aftermarket carplay/android add ons?

Would I be better off going with rsnav? Do I understand that rsnav will have to run off my phone as a Hotspot? Thanks a lot for any info.