Hello.
I purchased a Murena Fairphone 4 while visiting family in Europe and have been using it in the USA for several months now. My carrier is Mint Mobile (T-Mobile MVNO), and I am happy to report that the /e/OS 1.6 update has made it possible to enable 4G calling!
Initially, the phone would drop down from 5G to 3G or 2G for calling and then reconnect to 5G after the call finished. When T-Mobile started shutting down 2G/3G here in my area of the USA, I enabled Wifi calling (VoWifi), which had recently been added to /e/OS. Now, a short wait later, 4G calling can be enabled, and it works!
The only remaining issues for me:
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There is no visual voicemail for my carrier (Mint Mobile), which probably needs to be addressed by the carrier itself.
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There are occational issues with the proximity sensor not turning the screen off during a call.
I can now fully recommend the Fairphone 4 to anyone in the USA!
And the Murena Fairphone 4 seems to be the best de-googled phone you can get that also works in America. Hopefully they will become more available to us in the future.
Thank you to all of the developers that made this possible!