No idea, but Tello always worked outside of the U.S - Lithuania in my case. I guess, provider will always consider your country where the phone number is locat

No idea, but Tello always worked outside of the U.S - Lithuania in my case. I guess, provider will always consider your country where the phone number is located. Funny thing, while I'm roaming, my IP address will always be Lithuanian. It does not matter where the world I'm currently staying.