I cannot use my iphone4s in China

I bought it last year in Australia when the iphone 4s first time came out, but when I was back to China, I cannot use it with my Chinese SIM card.
Someone know why? and how to fix it

It sounds like your iPhone may be "locked" to the specific Mobile carrier in Austalia that you signed up with there.  If so, ONLY that carrier is capable of "unlocking" it.
Hope this helps

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