Audi Connect: data roaming for Canada?

I see that in my US version Audi Connect setting, there is a toggle for Data Roaming. Does that means I can use the provided T-Mobile SIM card for data in Canada?
If so, anybody actually done that? How much do they charge? Will I be billed for it or is it prepaid? If it's not for Canada, that what is data roaming for?
Thanks!

I should have RTFM.
I poked around in T-mobile's Audi Connect page, that was seriously lacking in detail. Hence the post.Then I got back to the printed literature. It's all there: only works in the 50 states and Puerto Rico. No roaming in Canada or Mexico. Data limit 2GB before throttling.
Since many seem to have success using a non-TMo SIM, I wonder if a Canadian data SIM would work...
I wonder if there's any domestic data roaming supported; international I'm not surprised about, but what about when you're not in T-Mobile's network? Are you okay (data roaming included, at least some basic level like the 100MB the phone plans seem to get) or are you cut off until you get back into T-Mo coverage area?







