will my galaxy S blaze be working in China with a chinese sim?

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http://androidforums.com – im heading to China in the beginning of January and will be staying there for about two to three months. so i was wondering is it possible for me to use my phone in china with a chinese sim card. i heard if i unlocked my phone then i will be able to use my phone with any carriers, but i dont know if that's true for chinese carriers. also, is there any risk for unlocking a phone? i know nothing about phones:( helps are much appreciated!! (General)