Tethering is the term for using a cell phone broadband on your laptop with a data plan. You connect your cell phone via usb cable and use your laptop to connect to the web through the cell phone's data plan. It works great with smart phones and with Window Mobile phones. If your in constant need of a broadband connection this is an in expensive way to go.
Using the software almost saves you half of the time
Pda Net
Pda Net Blackberry
For Nokia Phones use this