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I use tello.com. You can get eSIM and activate it while you are outside the U.S. If you won't activate roaming, sms and calling will use wifi calling.

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Tello costs at least $5 / month though. Skype was jusy pay as you go.

I pay $6.5/month for the number. It is pay as you go for calling but you have to pay for the number.

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.

This is the major way roaming is implemented, transferring all data through your home network greatly simplifies things.

They can detect your country by IP address. Also AFAIR your cellphone sends CellID and/or location with every wifi calling connection attempt.

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