They are in the US.
Comcast tallies 8.6 million household telephone service accounts, making it the United States' third-largest telephone provider. As of February 16, 2011 Comcast has 8.610 million voice customers.
http://en.wikipedia.org/wiki/Comcast#Home_telephone
People are not, en-masse, going away from POTS and towards plugging a VoIP device into the back of their router.
Twenty bucks says the first poster is correct; I'm willing to bet that most of the Comcast "VoIP" customers are handed off as RJ11 into legacy POTS lines in the target residence. In fact, I've had trouble finding any way to get our cable company to hand off their telephony service digitally, making the claims of "digital phone service" a little laughable as they still hand it off analog. ... JG -- Joe Greco - sol.net Network Services - Milwaukee, WI - http://www.sol.net "We call it the 'one bite at the apple' rule. Give me one chance [and] then I won't contact you again." - Direct Marketing Ass'n position on e-mail spam(CNN) With 24 million small businesses in the US alone, that's way too many apples.