Are you talking about the Internet connection from a Virgin mobile? You could use a wireless router to network your computers together but it won't help you get online unless you subscribe to an ISP - Virgin, perhaps. The only way to share the mobile phone's connection with a computer (only one) is by USB tethering. Have you seen a setting for that in the mobile - possibly under PC Connection?
If the type of Virgin Mobile you're referring to is a USB wireless dongle, again a router wouldn't help but if you set the computer its plugged into to Share this computer's Internet connection", another computer should be able to share it.