This is posted as a "Most Asked" topic as determined by tickets opened for Support.
If my customer is roaming will they get the message through the In-App messaging API? Would this include countries outside the USA?
From the docs at https://developer.att.com/apis/in-app-messaging/docs :
"For the Send Message method.
Roaming within the USA is not specifically mentioned, but since this is a function of the target carrier, I think it should work.
AT&T, the AT&T logo and all other AT&T marks contained herein are trademark of AT&T Intellectual Property and/or AT&T affiliated companies.