Buying your own modem for Comcast Xfinity can save you roughly in rental fees. To ensure a smooth purchase, you must verify the device is officially Xfinity-certified and matches your specific internet speed tier . 1. Verify Compatibility and Speed

The most critical step is using the Xfinity My Device Info tool .

: Your modem must be rated for at least the maximum speed of your plan (e.g., "Fast," "Superfast," or "Gigabit Extra").