unlock a AT&T phone outside US

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I bought an AT&T locked phone in Europe, second hand,got authorization to unlock it.Can this unlock process be completed outside the US? Just want to make sure it works BEFORE traveling...
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Can you unlock an AT&T phone?
Submit unlock request formVisit att.com/deviceunlock/. Select Unlock your device. Read and agree to the eligibility requirements 1 to unlock your device. Complete and submit the form.What is the network unlock code for ATT?
When you enable SIM lock, your device asks you to enter a PIN code: The default PIN code for an AT&T SIM card is "1111".Are AT&T phones network locked?
Most cell phones come locked to a specific network. For instance, if you bought your phone from AT&T, it will only work on AT&T's network. The same goes for the other cell phone carriers as well. However, once you get it unlocked, you can take your device to a multitude of carriers!Are AT&T prepaid phones unlocked?
If you buy a phone labeled AT&T, T-Mobile, Verizon, Straight Talk, Net10, cricket, etc, the phone is locked out of the box to that carrier. Even Verizon now locks phones for at least 60 days.Unlock a New World, Italia!
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Images: William Fortunato, Anna Shvets, Tim Samuel, Anna Shvets