Jim, We presently have one land line (verizon) and a Vonage line for us. We have two cel phones, but we don't use them much, so we have Virgin Mobile plans where we just have to top up every three months. I think I have $150 on mine at the moment...
We have considered moving from DSL to cable modem, and putting both lines on the Vonage system. It can wire into your house wiring just fine...
Charlie