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.
Do chat with CS and ask. All depends on where your order is in their process. Chat can be found in several places, easiest to find is on the main Tesla page, select MY and then there should be an icon in the lower right for chat.