How to unblock an US iPhone to use it in France

Hi everybody I'm French so excuse me for my bad english...
My sister offered me her iPhone wich she used with AT&T phone operator, and she told me that it was unblock but when I put my SIM card, iPhone write : SIM no valid, ask your phone operator to unblock your iPhone.
How can I ask to AT&T to verify that this iPhone is really unblock and if it don't, how can I unblock it?
Thank you.
Oceane.

If your sister already was told the phone is unlocked, you need to install your sim and activate to complete the unlock.
Per apple support: If you have a SIM card from a carrier other than your current carrier, follow these steps:
Remove your SIM card and insert the new SIM card.
Complete the setup process.
https://support.apple.com/en-us/HT201328

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