I was recently in Shanghai. Great city! Enjoyed the trip, the city, and the people. When I travel, I usually use cash, not credit. There's plenty of ATMs around, and Shanghai was no exception. One of the things that really struck me while I was there was the overwhelming presence of mobile computing. I mean, when I was on the subway in Shanghai, all I could see were the tops of people's heads. Everybody was on a cell phone.
Now I've been around. I've been on the London underground, Paris and Vienna metros, New York's subway, and Washington DC's transportation system. Sure, we all use our phones, but we usually look up every once in a while, and we don't stay on them that long. But in Shanghai, it was completely different. Mobile computing is completely integrated with modern Chinese life — in Shanghai at least. And I expect Beijing is no different.