Advertisements That might have been the case originally, but I'm pretty certain their billing system now does know the difference between a CableCARD and a cable box. The reason I say so is that about 3 years ago, my bill shot up by about $30 and my bill showed 4 cable box rentals. When I called to complain I was told the billing system, got screwed up and changed my 3 cableCARDs to cable boxes (I do rent one box). They corrected this. The same thing had happened when I first signed up for cableCARDs about 6 years ago. That was back when the box rental fee was about $10 instead of the $3 it is now though.