This WiFi + router requires you to have Internet already, and it has to be wired to the Internet to work. It is not a modem, it is a router. You must have a modem already from either your Internet Provider, or one you purchased and have set up with your Internet Provider. This gives you WiFi if you do not have WiFi but do have Internet. As far as I know, it will work with any Internet provider in the USA, but you must have a modem already to connect it to, or a Modem/Router combination. If you are looking to replace your Internet Service Providers, modem, then you need a Modem or Modem/Router that will work with your ISP.