What you presumably 'want' is lots of data on your phone from my understanding. There is a thread on SIM cards in china that does address this issue, and there are data-only solutions possible. But "I want" doesn't "I get". The 3G speeds here are slower than USA, at least in my experience, but can be tolerable.

Data is actually pretty cheap, again, compared with USA. Modest overage is affordable, but if you really go insane it can cost you. I have a monthly plan, and if I go over, I think the charge is c. 0.0003 RMB/kb so 1GB would cost you 300 RMB (c. US$48).

tb