If you don't have an unlimited internation data plan with your provider, you'll be charged for the email. That won't be so bad unless you use the browser. The browser will cost you.
You'll be stuck for the phone calls at a rate of at least $1/minute, depending on your provider. If you expect to make a lot of calls, it will pay to buy a phone in China and use that.
There are a few threads on this board about unlocking blackberrys so that you can use a SIM chip you buy abroad. As best as I can tell, Cingular will unlock your phone after you've been with them for 90 days, but you won't get blackberry services unless you contract with some provider in China for them.
I use an old+lame motorola p7389 when I'll be out of the country long enough to really need a phone. For trips of a week or less, I use my blackberry and pay the bill. I do have the unlimited international data plan with Cingular.
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BIS (ATT)
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