[jonknee]

My car (a Hyundai) is keyless like that so you just need the key to be on your person. There's no technical reason why this couldn't be done with NFC on a mobile phone, but I think the excuse would be about car thefts. Modern cars all use chipped keys that are really stringently tied to dealers and car thefts have plummeted during recent years.

It's a lot more convenient than I would have guessed though, one of the nice bits that I noticed is my car lights up when I walk up to it at night. Not bright, but the LED under the mirror illuminates the ground around the driver side door. Very neat.