BM, if you did it that way, you'd be using wireless connection to internet, NOT your ISP connection. He isn't saying connect your phone to your router wirelessly. He's saying use your WIRELESS cell phone provider's service to connect to internet, and then use a Smartphone as a WiFi hotspot and connect your home computer to that.

That works, and it solves your usage-based billing issues, but without 4G LTE (which you ain't gonna get for many years out there), you'll be really slow that way.