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.
Note: This feature may not be available in some browsers.
I have the same issue with my Model Y, purchased in December, and my iPhone. Not all of my Contacts and none of my Favourites sync across from my phone to my car. Grateful for an update if anyone finds a resolution. Thanks in advance.