I have been a Manager with a third party ATT group for 5+ years. I have seen several situations, and have vast knowledge in ATT International travel questions. All the way from troubleshooting, to how international is billed as well as basic International travel questions on device usage.
Contact me for cruise ship information!!! Also, traveling to a country in the North American dialing pattern? Much useful information there. Gulf of Mexico roaming...very pricey, I have all the answers you need!
I can also help with many domestic issues....I was a small business manger as well for 2 years ...hit me up!