HT1688 I got new iPhone 5s on At&t from USA friend, I live in China. How can I activate this phone in China

I got new iPhone 5s on At&t from USA friend, I live in China. How can I activate this phone in China.
In China there are 3 carrier - China Telecom, China Mobile, China Unicom.
How can I activate my iphone and change carrier ?
Please help me
Regards.

You can't. Send it back to your friend, & have him/her get the phone officially unlocked for you.

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