Hong Kong's use of Technology

A couple of friends, Rob & Becky Dickson, live in Hong Kong and Rob loads up his watch with credits so that when he rides the subway, he simply wands his watch near some sort of reader at the turnstile. I always though that was pretty cool as I would fumble through the coins, he would just walk right through. And now I see that you can send a text message (SMS) to the police in Hong Kong. I wonder what else the city has that I haven’t noticed!