Before you start the self-activation process, make sure to collect your account number, account phone number, and login information (your email address or user name and password).
To activate your Internet connection with Comcast XFINITY’s self-activation process:
- Close all web browsers.
- Launch a web browser.
You are redirected to the XFINITY self-activation page. If you are not redirected to the XFINITY self-activation page, visit Comcast.com/activate. - Provide your XFINITY credentials and complete the self-activation page.
This might take up to 15 minutes, during which your cable modem or modem router reboots a few times. - If you are unable to activate your cable modem or modem router using the self-activation process, call Comcast XFINITY customer service at 1-800-XFINITY (1-800-934-6484) and do the following:
- When asked, provide your account information and provide your cable modem or modem router’s model number and MAC address, which are on the product label on your cable modem or modem router.
- Wait for Comcast XFINITY to confirm that your cable modem or modem router is active.
- If you do not get an Internet connection with your cable modem or modem router, ask Comcast XFINITY to look for your cable modem or modem router online, and do one of the following depending on what Comcast XFINITY tells you about your cable modem or modem router:
- If your cable modem or modem router isn’t visible, Comcast XFINITY can give you instructions to verify why your cable modem or modem router does not connect with your high-speed Internet service.
- If your cable modem or modem router is visible to Comcast XFINITY, reboot your cable modem or modem router and check your online status again.
For more information, see How can I troubleshoot my cable modem?.
Last Updated:07/07/2025
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Article ID: 24939