If i give someone in China an iphone bought in America will they be able to use it?

I want to give someone in China an iphone as a gift. But i'm wondering if they'll be able to use it there? Like to sign it up with one of their phone carriers or something.

If it was bought from at&t you will have to get it factory unlocked first the fastest way is to buy this unlock on ebay:
http://www.ebay.com/...1439.l2649

it is only $3 and you will be able to use your iphone on any GSM carrier worldwide

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