Instructions
Connect the AirCard to its corresponding mobile broadband router. Follow the specific instructions that came with router. Power on the devices once you have them fully configured so they can broadcast a wireless signal.
Power on your Wii and point at the "Wii" icon and press "A." Click the "Wii Settings" button and scroll through the options until you find the "Internet" button. Click any of the open Internet connections that haven't been configured.
Click "Wireless Connection," and then click the "Search for an Access Point" button. You will see a prompt window asking you to choose from one of the available access points. Click "OK."
Click the AirCard connection. By default, the connection will be named after the AirCard manufacturer. Click "OK" to confirm that you want to use that connection, and then click the "Save" button.
Update your Wii if prompted to do so. Follow the onscreen instructions to update the firmware. Restart the Wii and click on the "Internet Channel" to connect to and browse the Internet.