In the Network and Sharing Center (which you can open from the Control Panels window or by right-clicking the network icon in the Windows Tray), select "Set up a new connection or network."
Even though the Sprint service is wireless, the connection to select is Dial-up.
If the computer has recognized the EV-DO card, it will be listed along with any other modems in the device. Select Pantech PC Card.
Vista logs on and the EV-DO negotiates the network connection with Sprint.
I've selected the Public location setting, so that my computer is not accessible when I use the Sprint connection. Vista displays a dialog confirming the settings and that the computer is connected to the Sprint network.
This dialog may display multiple options, including available Wi-Fi networks. Select the Sprint option and click the Connect button at the bottom of the dialog.
When disconnected from the Internet, Vista will display a dial-up dialog on the Desktop that will connect the computer to Sprint.
EV-DO Rev. A offers faster connectivity than the first release of EV-DO. On this day, over this connection, Sprint delivered 996 Kbps downstream and 128 Kbps upstream speeds.