Can I take locked AT&T phone outside US?

Majestic L

New member
I have a 2-yr standard contract FAMILY PLAN with 2 cell phones - one with me and one with my mom. Can my mom take her phone outside US (it won't be usable outside US but she can reach out to me after the security check in the airport in any case)? I will continue to use my phone within US and continue to pay the family plan using all minutes in my plan. Please advise!
 
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