Hello @arbrie,
Welcome to the Community Forums! I can understand how worrisome it is not being able to log in to your account, I would be happy to help you with this!
Currently there are some countries which restrict access to logging into your AT&T account. You will be unable to log in while abroad. I will be sending you a private message to provide more information, please be on the lookout for it!
I hope you will travel safe, and have fun abroad!
Jessica, AT&T Community Specialist