I just want to unlock my iphone i want to use it in china

i just want to unlock my iphone i want to use it in china
who can help me to unlock the iphone 4  baseband 04.10.01
thank you

thank you for your answer.
but i bought in America. I stay in there for some time, so I bought the iphone4 in there. but now, I come back to china, and my iphone is lock....
so I want the APPLE or the AT&T give me the iphone unlock...
but how can i do to let the apple or AT&T unlock my iphone
thank you
thank u so much

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