After doing a little bit more research, I found this. Though it's not what I'm looking for, but it would be great if you're out of town and would like to share your 3G Connection among your family while on a road trip. CradlePoint Technology
The PHS300 creates a fully portable WiFi Hotspot from broadband-enabled cellular phones and modems. Take WiFi to a new level by 'bringing it with you'.
Built-in firewall keeps you in control of your Cellular bandwidth, and WEP/WPA security allows you and your colleagues to work in a fully secure environment.
Complete Plug-and-Play solution. Plug in your phone or USB modem, connect your PC to this Hotspot, then surf the Internet.