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Amazon.com: RJ11 Cable ADSL 33ft Extension Lead Phone Cord Telephone Plug High Speed Xfinity Internet Broadband Male to Male Router and Modem to RJ11 Phone Socket/Microfilter/Landline Wire (Black) : Electronics
ANSWERED: How to Make International Calls with Xfinity Voice and Xfinity Mobile | Xfinity Community Forum
When Comcast sets you up for their landline phone service, do they change the plug-in place on the wall? - Quora
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