In particular, one thing has been bothering me about the key card entrance method. It's not the functionality or the actual security of the card itself. Rather, I'm wondering if there is a way to "Lock down" the card's functionality from being used on other phones. I understand that you use the card and your phone's NFC to connect your own Tesla App to the car, and then you just use your phone as the key in most situations. But let's say you need to valet park the car. You'd give the valet your key card, and go into your restaurant or theatre or party for a couple of hours. What's to stop that valet from using NFC on his own phone to gain permanent access to your Model 3? And yes, I understand that all you'd need is a simple "Don't allow new phone-keys" button in your Tesla App to prevent this. I'm just wondering if something like this already exists, or if Tesla has thought about it? Can anybody here who has some experience or insight into the Model 3 shed some light on it?