About using Mobile Internet to tether your smartphone
Depending on your wireless service provider, you can use the Mobile Internet feature to set up your BlackBerry® smartphone as a modem by connecting it to your computer with a USB cable. This is also known as tethering. Using your smartphone as modem allows you to connect to the Internet on your computer when you might not otherwise have access to the Internet. This feature isn't available for the BlackBerry® PlayBookTM tablet.
You can use only one smartphone as a modem with your computer at a time. If your smartphone 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.