but you said you dont have a landline?Well according to the cable company all i have to do is disconnect my phone and plug it into my lap top........hmm what a ruse
cable and dsl are two different broadband connections.
if your internet modem is plugged into a phone jack, then you have dsl.. and if you have phone service with the company, then yeah, you can use your dsl connection and make a phone call/dialup connection at the same time... you'll need a filter, which the phone/dsl company should of provided you.