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.
How soon are you expecting to take delivery? The terms you are thinking of doing? Those can all affect the rate. Check out the finance thread (here) for more info for monthly rates.
Here's from Tesla:
When should I start the credit application?
You can apply any time after you place your...
Another place to look is the Privacy setting. Tesla recommends turning on "Always" for Location Service. That means Tesla wants to know where your phone is even when you are not using the app.
Have you tried finding it in the source code on the website to see if the VIN is still there? Sometimes the VIN number appeared and disappeared on the app without warning.