About Mobile Internet
Depending on your wireless service provider, you can use your BlackBerry® device as a modem by connecting it to your computer with a USB cable. Using your device as modem allows you to connect to the Internet on your computer when you might not otherwise have access to the Internet.
You can use only one device as a modem with your computer at a time. If your device is associated with a BlackBerry® Enterprise Server, contact your administrator to make sure that the appropriate IT policy is turned on to use this feature.