ATT works on my 2014 RS5......... Everything works via 3G......... YAY!!!!!!!!!!!!
I tested GOOGLE MAPS, Google Search, WIFI works, 3G symbol on dash appears, everything works fine!!
Here is what you have to do:
If you have an ATT plan with a tablet device for 9.99 per month, you can convert that to a regular size sim card, the bigger one of them all to use to insert on the Audi.
1- Go to ATT store and get a new regular large sim card that fits on the Audi slot. You might have to pay for it (20 bucks)
2-Then you get out of the store and call ATT 611, do not let the store activate the sim card for you, because they wont be able to.
3-Tell the ATT Rep to activate your ipad line to the new large SIM card you bought at the store. Make up a story that you dont have the ipad anymore and you have a car radio with the IMEI number of the Audi.
4-Give them IMEI number and the new ATT large sim card number so they can activate it.
5-Once they tell you its done then go to the Audi and insert the sim inside.
6-Go to Telephone on MMI controls and choose Settings
7-Once you are in settings then go to Data Connection and then Connection Settings
8-Make sure the APN reads "Broadband"
9-Leave user name and password blank with Authentication set to "Normal"
10- Thats it and then you wait till you see 3G light up on the lower right of the screen.
11- Its super fast with ATT...
PM me if you have any questions.....