You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
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You will have to go back to the SC to get it installed. That means you will have to schedule an appointment with them. That I haven't quite figured out how to do.
Click on the vehicle in your account. On the following page, you’ll see Autopilot as a selection. Click that image and it will allow you to purchase the upgrade. It should take effect within a couple of hours.