Verizon Fios, also known as Fios by Verizon, is a bundled Internet access, telephone, and television service that operates over a fiber optic communications network with over 5 million customers in nine U.S. states.Verizon Fios, also known as Fios by Verizon, is a bundled Internet access, telephone, and television service that operates over a fiber optic communications network with over 5 million customers in nine U.S. states.