Hi! New here and just ordered my Yukon. I have a question tho about the app. My husband has a 2018 Sierra Denali and with the app he can start the truck, unlock the doors, check tire pressure etc. And he doesn't pay anything to be able to do this, and it's never cost him anything. But everything I can find says that requires a 14.99/month onstar subscription. Am I missing something? Is this a thing that used to be free that just recently started being a paid service and his is grandfathered in somehow? Has he just been lucky?