How to unlock my Lumia 640(AT&T No Contract)

I buy a microsoft lumia phone (AT&T - Microsoft Lumia 640 - No Contract) on August 8, 2015. Now i am in china , i can't  use the mobile phone network here. I must enter the unlock code . How do I get the unlock code?
 

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Last updated July 5, 2019 Views 838 Applies to:
talk to AT&T.

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At&t told me to go f#%K myself when I tried to unlock my own phone for a better carrier. God luck, but don't be surprised.

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Trying to unlock my nokia 640, apparently it's not possible.  Good job Microsoft.

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Trying to unlock my nokia 640, apparently it's not possible.  Good job Microsoft.

Same way for all carrier subsidized phones in the US, the carrier has to SIM unlock the phone.

This has nothing to do with Microsoft.

Lumia 1520.3 Surface RT

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