Can I use a TW in China ( Shanghai ) and with which carrier /Provider ?

Check with Shanghai Mobile. This site lists carriers which may also serve that area.

http://www.cellular.co.za/cellular-n...world-a-ch.htm

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John Bartley K7AAY | http://celdata.cjb.net | http://kiloseven.blogspot.com

I'm using the TW in China now. You can buy one of those sim-card from any telecom stores in China. The most popular and reliable one is issued by China Mobile. When you buy the sim-card, you will be giving a local mobile phone number. The sim-card is value stored, you can buy the value add card to add value on it when your card is out of money. You can make international call with that card too.