Apple doesn't. Apple isn't right now. It's not like the iSight where the continent in question banned one substance in it and Apple took it off the market worldwide, but you should be able to sell him one.
Here's an answer with no irrelevant remarks in it:
Apple doesn't sell the iPhone in China right now because they don't have a carrier contract with anyone. There are rumors about it coming there soon though. You can still use a 3G or original iPhone in China if it is unlocked. One thing I'm not sure of is whether all the frequencies will work there.
I thought china was getting the iphone, I thought apple was supplying them with a bunch of edge only "3g" iphones for china mobile or whatever their main cell company is.