https://blog.kamens.us/2009/11/16/how-to-lower-your-phone-internet-cost-from-80-per-month-to-50-per-month-buy-your-own-cable-modem-and-kick-comcast-to-the-curb/
How to lower your phone + internet cost from $80 per month to $50 per month: buy your own cable modem and kick Comcast to the curb