The best way to see how much data you are using is to log into your account periodically at http://www.ziplinkinternet.com/my-ziplink-internet and view the usage so far in your billing cycle. For more detailed information related to your computer, you can install a program such as Networx to monitor your computers data usage. http://www.softperfect.com/products/networx/ However, please keep in mind that other devices, like a DirectTV receiver that accesses your internet connection, will not be metered because the data does not flow through your computer. The same goes for devices like iPhones, iPads and other Smart Phones.