Have you tried T-Mobile? I don't know what they have configured, but they certainly own a lot of midband 2.5mhz spectrum in east idaho. They have 140mhz in Idaho Falls and Twin Falls, and 180mhz in Pocatello, and at least 60mhz everywhere else in east idaho. It looks like they have a decent amount of sites too. I'd have to dig a bit more but if you don't have access to 5g on T-Mobile today, it's not gonna be more than a couple months away.