A Mobile Virtual Network Operator is a wireless communications services provider that does not own the wireless network infrastructure over which it provides services to its customers. An MVNO enters into a business agreement with a mobile network operator to obtain bulk access to network services at wholesale rates, then sets retail prices independently. An MVNO may use its own customer service, billing support systems, marketing, and sales personnel, or it could employ the services of a mobile virtual network enabler (MVNE). http://en.wikipedia.org/wiki/MVNO
company that pretends to be a CellCo but really just licenses services delivered by another company.