Will an iPhone bought in the US work overseas?

I recently bought an iPhone 6 from AT&T in the US, but I'm moving to China in a few weeks, and I'm wondering if I can still use my phone there. I have a few relatives who work in China, and they suggest that I use China Unicom, so I'm using that carrier. Is there any way I can unlock the phone, or just be able to use the phone in China?

You can always get the phone factory unlocked and overseas with your GSM carrier. If you need help with getting the phone factory unlocked, mail me.

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