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I wish to replace the Comcast cable modem router with my own by purchasing as Comcast does not sell their used equipment. Does Comcast recommend or require that only certain a modem router can be used? I will need a cable internet modem router with WiFi and a phone jack/port.
You can find their approved list here;
There are a limited number of customer-owned devices that are approved for use by Comcast. You can see the list here: http://forums.xfinity.com/t5/Home-Phone-Service-Equipment/How-to-purchase-and-install-a-voice-modem/...
If you have further questions, please feel free to ask!