I use Redpocket.com. I ported my US number to them from Verizon. They have a plan you can buy on Ebay for $60 annually and a slightly more expensive plan on their own site, redpocket.com. My US phone number is a "normal" number; i.e., it can receive SMS for authentication. It works perfectly with WiFi calling when i have WiFi coverage at my home abroad -- or in a cafe abroad--and randomly works when i have cell service (though they don't provide support for cell problems when when roaming.) That way i have a US number i can keep permanently for a cheap price. I have used it in several EU countries and in LatAm, and it works.
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