When I call to self-activate a cable modem, what information are they going to ask for to verify the account? I know I will need the mac address but what else do I need to give them? I have to get the account owner (my dad) to provide all of this stuff to me ahead of time so there are no issues.
Note: I will only have a cell phone with internet during this process
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Connect it to the coax line and power it up. Let it fully sync up with the system ("DS, "US", and the "Online" lights are steadily lit). Connect a computer to it and open up a browser. You *may* see their "Walled Garden" modem self-registration page. If so, follow the screen prompts. Have your mobile telephone number, your Xfinity username and password, or the account number and telephone number associated with your Comcast account handy.
If not, try calling 1-855-652-3446. That is their device activation line.
If that doesn't work for you, you can call 1-800-comcast and tell a rep that you would like to have a new modem provisioned for service. Have the RF / CM / HFC MAC address and the serial number of it handy when you call.