I love the idea. I used to carry a phone, a bunch of keys, and a huge wallet to the point of hurting my spine. Now I carry a phone, a few cards in a clip in my front pocket and a car key fob. Every other system I interact with already has NFC enabled (house lock, office lock, gas pumps, most stores) or keypad (garage…

Waze (owned by Google) has the option to display both, this may/will have the same. I even have it set to give a ding if I go 10 MPH over.