To use your BlackBerry as a modem you’ll need the USB cable that came with your phone and you’ll also need to have your BlackBerry Desktop Manager installed. Your Desktop Manager should have come with your phone, but if it didn’t, you can download the latest version for your phone from the BlackBerry website. After installing, check under “modems” in the control panel of your laptop to make sure that the drivers were also properly installed.
Next, add a new connection to the existing Internet connections on your laptop. How you do this will differ from person to person, but do it as you would if you were using a new connection at a coffee shop or some similar location.
With Desktop Manager open, connect your BlackBerry to your laptop using the USB cable and click the connection associated with BlackBerry and you are now online using your BlackBerry as a modem. Remember to check with your carrier if you’re going to be using your phone as a modem frequently as excessive charges may apply if this is not included in your monthly plan.