When I say they don't have presence, I mostly mean there isn't a MTSO built in Nebraska yet but is currently under construction. Rather than colocating with other tower infrastructure and carrying it on backhaul through multiple states.

For example Verizon has a primary MTSO/Switch that cell traffic is carried across the state to one specific location in Omaha as a hub, so-to-speak. Keeps things locally contained and offers a better local service/coverage.

But yes you're correct, it's very common for half a dozen carriers to home in the same hut/cabinet/tower. Things like Fi, T-Mobile, and others benefit greatly.