Verizon Fios is a bundled Internet access, telephone, and television service that operates over a fiber-optic communications network with over 5 million customers in nine US states. The name, Fios, is an acronym for Fiber Optic Service. Service is offered in some areas of the United States by Verizon Communications, while Frontier Communications operates licensed FiOS services in former Verizon territories across six states, using a nearly identical network infrastructure.