So how do you connect to the Internet? - assuming it's via cable?, why is that any different to a phone line?.
I moved my Internet to a wireless service a while back (as the phone connection was crap), and used a Voip phone service (which has free caller ID, and is basically 'pay as you go'). More recently I've moved back to a phone line, as FTTC became available, and while it's a long way to the cabinet and I don't get quite as high a speed as the wireless service, it's unlimited and slightly cheaper. It obviously comes with a phone connection, but I've never had a phone plugged in, and don't even know what the number is - I've simply continued using my Voip phone. If I need to ring my ISP for anything, I'll plug a phone in, as calls to the ISP are free from that number.