No, you don't need a modem for Verizon FiOS internet. Verizon FiOS offers a pure fiber internet connection. Pure fiber connection uses an Optical Network Terminal (ONT) to convert fiber signals into a form that your router can utilize. Therefore, an ONT box functions as a modem in a DSL or cable connection. A Verizon technician sets up the ONT box either near your home or in your home and links it to the router in your house.