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If you want to have WiFi, then yes, you do. Put simply, the modem interfaces with your cable connection to connect you to the internet. A router interfaces with the modem to give you Wifi. I'm using this modem with the Google Wifi and Xfinity service and it's been great.
Sorry, there was a problem. Please try again later.If you do not already have a router, yes you need a router. There are all-in-one cable modem and routers, but make sure to get the list of compatible devices from Xfinity.
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