Do you know how providers detect your country when using wifi calling? Mine says it's only valid while you are within the country, wonder if VPN would work around it.
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.
