My iphone 5s A1533 didnt want to unlock.

wrote operator, they said that unlocked, but as soon as I put my sim to iphone asks me to activate the native simkarty. What should I do? I can not use it in another country. The operator AT & T.

Did you follow the instructions? Like restoring your phone as new via iTunes on a computer? Did you get the "congratulations your phone is now unlocked" message in iTunes after restoring?
How to unlock your iPhone for use with another carrier - Apple Support
If you need to activate the SIM you need to talk to the carrier whose SIM you are trying to use.

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