It probably varies by carrier, but you CAN get cable internet service without signing-up for cable TV. Comcast does this, but charges an extra $10 per month for it. By the way, to get DSL you don't need another phone line; one line carries both the analog (voice) and digital (DSL) signals. You can talk on the phone and surf at the same time. You simply have to add the supplied filters to lines going to an actual phone in order to filter out the digital signal for talking.