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.
Did you get your Model S 2018 converted to use CCS adaptor? I note Tesla UK list that conversion only for Model X. In other threads it seems it is required in Australia as they are converting all chargers to CCS.