Activating internet without mobile app

Connect it to the coax line / outlet and power it up. Let it fully sync up with the system. Check that the front or the top panel indicator light(s) is / are steadily lit. 

Then 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 self-install 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.

Hello user_xe9e9n, thanks for reaching out to our Forum for help with your activation. The Xfinity app is certainly a quick and easy way to get your modem added, but I have your back all the same. Were you logging into the Xfinity app or the Xfinity website when you receive that message? I'll need to get full access to your account in order to help. In order to get started can you please send a direct message to Xfinity Support with your full name and full address by clicking the chat icon in the top right? Here's the detailed steps to direct message us:

• Click "Sign In" if necessary

• Click the "Direct Message” icon (upper right corner of this page)

• Click the "New message" (pencil and paper) icon

• Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list

• Type your message in the text area near the bottom of the window

• Press Enter to send your message

@user_xe9e9n 

Were you able to get it activated with any of those methods ?