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my xfinity phone line not working at all

New Poster

my xfinity phone line not working at all

i just went to the main office exchanged the moderm for another one cause my caller ID wasn't working and also it continue cutting out the internet service so i took it in for another one and now i can't get the phone to way at all and i do not have a cell phone at the moment.

Regular Contributor

Re: my xfinity phone line not working at all

Have you activated your new modem?  If not, try:



  1. Unplug your old device from the coaxial outlet and plug your new gateway into that same outlet. 
  2. Connect the power connector to the new modem and electrical outlet.
  3. Connect the phone connector (RJ11) to the new modem (TEL1 port).
  4. Wait for the modem to come online. The lights on the modem will let you know when it is online. It may take a few minutes to connect the first time.
  5. Once the modem is online, connect your computer. Do not connect router if any at this point.



Before you start, make sure your account number and telephone number are readily available. This information can be found on your monthly statement or order confirmation e-mail.


  1. Open a web browser. You should automatically be directed to the XFINITY Activation page. If not, please go to
  2. Enter the account information and additional details for which you are asked via the webpage.
  3. After entering the appropriate information, activation will be complete.

If the online activation does not succeed, call customer support: 1-800-COMCAST (1-800-266-2278) or 1-800-XFINITY (1-800-934-6489)


Or Try calling 1-855-652-3446. That is their device activation line.

New Poster

Re: my xfinity phone line not working at all

Diamond Problem Solver

Re: my xfinity phone line not working at all

Did you try any of the suggestions by @bobhc?

I am a Retired Official Comcast Employee
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