This seems to have been asked and answered a while ago but the information seems to be out of date in 2020.

The vehicle has a data SIM slot and comes with a 3 month trial of AT&T. What stops working at the end of the trial if not renewed?

Shopping around I can get unlimited data only SIM cards from Sprint for $15 a month, from AT&T for $25 a month ($20 before 2/29/20), and share my 8 GB phone data on Verizon for $10 a month. Is it possible to use any carrier now or are we stuck with AT&T?

How much data does a car use? Is unlimited needed?

 

In case anyone is researching this in the future, I'll answer my own question. Per the dealer, AT&T only, but that may not be completely accurate. I have read reports of people using other carriers. I signed up for unlimited with AT&T. My 2020 DS used 153 MB last month.

 

Unless it is carrier locked any GSM Carrier sim should work. If you have a friend on a GSM Carrier, such as T-Mobile pop their sim card in and see if it connects.

 

I think TMoblie was the carrier that was referenced elsewhere as an option. So far I haven't had any issues with AT&T. There is no contract so if I do it is good to know there are options.