My first experience with an app for a car was when I bought my wife a Lincoln Nautilus back in January. It came in very handy a few days ago when she locked her key fob in the car and I could remotely unlock it for her. It can lock/unlock the doors, start/stop the engine, honk the horn and flash the lights, and roll the windows up/down. It can also show the exact location of the car and show the gas level, oil life left, tire pressures, and mileage. Of course I have nothing to compare it to but it has been a great experience. I can see how this extended to an EV could be extremely handy.