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.
If you have enough connectivity to read a web page, here is Tesla's page on how to connect to the gateway over your local network: Connecting to Tesla Gateway | Tesla Support
If you know the IP address of your gateway on the local network, going there with a web browser will let you see the production and charge. The default password is the last five digits of the serial number for your gateway. If you don't know the IP address, connect to the wifi network the gateway broadcasts (TEG-XXXX). The wifi password should be your gateway serial number. Then go to https://192.168.91.1
Best of luck and I hope you don't have too much damage.