My wife & I had not updated our iPhones to the new Tesla app, just our iPads because we don't like the new UI. It is significantly worse than the old UI. For example, you can't adjust the charge limit if the car isn't plugged in. On the screen where you see where the car is on a map you can no longer see vehicle speed, that's now on a different screen. And there are more issues. But as of today the old mobile app no longer works... This is very frustrating!!