MVNO stands for mobile virtual network operator. An MVNO uses other carriers’ networks instead of building its own. Because an MVNO isn’t maintaining a network, it can sell its services at lower prices than other carriers. But sometimes, the MVNO’s users will be deprioritized in favor of the borrowed network’s customers. That can get frustrating for anyone using the MVNO. Mint uses the T-Mobile network, so sometimes, Mint customers are deprioritized for T-Mobile customers.