> You are eligible for Service only if you or your employer has a customer or business address within UScellular licensed market area. If you meet the eligibility requirement only through your employer's business address, you may only be eligible for certain rate plans.
> At least 50% of your monthly usage for each device on your account must be used in UScellular licensed markets.
These kinds of terms are common for cellular plan, but it's less of an issue for companies with "nation-wide" networks.
I would love to switch to a MVNO that runs on multiple networks. It would certainly be more expensive, but it would be nice for people in areas with poor coverage, since roaming is dead.
[1] https://www.uscellular.com/legal/customer-service-agreement