If you are a small smartphone company, getting your phones accepted for use on one of the three Big Telecom Mobile networks is difficult. It's a barrier to selling phones and makes it real hard to enter the US market.
Murena is the smartphone brand owned by non-profit e.foundation which produces their own fork of Android with all the Google spyware removed.
So anyway "Murena" has started their own brand of MVNO network based on T-Mobile USA.
https://techcrunch.com/2024/01/23/murena-android-google-mvno-mobile-plans/https://murena.com/america/murena-mobile/I'm already on T-Mobile and my phone (Fairphone 4) works just fine so I'm unlikely to switch, but this tells me that /e/ foundation and Murena are serious about the US market which brings the fight against Google spying right to Google's heartland.
There is some precedent for this: the Librum 5 Linux phone by Purism started offering their own MVNO and I assume this was mainly because they had problems with US mobile carriers.