It looks like Circles.Life has 5G support without needing to subscribe to VAS.
According to their blog, they mentioned the following (see attachment).
Furthermore, we have confirmation that some Circles.Life users on iPhone 12 are getting 5G signal. They are able to get speedtest speeds of 200 Mbps in some areas.
We have asked Circles.Life but they did not say if 5G is officially supported on their network (which rides on M1).