Wireless Data

I have an LG 4015 phone and a usb data cable for it, as well as internet service up and running on the phone. What I need is software to open a link between the phone and the pc, in order to let me use my phone as a modem. I know of several you can buy, but does anyone know of ones that are free out there? this is really frustrating, especially as I have seen people do this before, and very easily at that. thanks