MNO (Mobile Network Operator) would most typically expose APIs to MVNOs (Mobile Virtual Network Operator) to enable better integration and interoperability between their services. By exposing APIs, MNO can allow MVNO to access its network resources, such as billing, authentication, provisioning, and customer care. This can benefit both parties by reducing operational costs, improving customer satisfaction, and creating new revenue streams. For example, MVNO can offer customized plans and features to its subscribers using MNO’s network infrastructure, while MNO can leverage MVNO’s market reach and brand loyalty.