Xfinity includes an automated Spam Blocker that categorizes calls as high, medium, or low risk. By default, high-risk calls are blocked automatically. How to Block Calls on Xfinity Mobile
For persistent spam calls, consider adding (free for Xfinity Voice users) — blocks robocalls automatically. comcast how to block a number from calling you
If you’d rather send specific numbers to voicemail or another number: Xfinity includes an automated Spam Blocker that categorizes