how-to block ads
More likely than not digital cable boxes for sale on eBay or sites like Craigslist, and others, were stolen. Comcast will not activate boxes bought off the Internet.
If you have bought one, you should return it to the closest Comcast location and pick up a legal box from that center.
If you want digital cable service you should rent a cable box from Comcast or, if you'd like own your own equipment, you can purchase a TiVo HD or Premiere.