In this video, the instructor shows us how to tell if a device (cell phone or other device) is tethered or un-lockable. Before you begin, you must download a tool called f0recast onto your laptop or desktop computer. After the application is downloaded, you must plug in your device to your computer (Windows only). Once you've done this, a window will show up from F0recast that will show you all of your phone's information. This includes if it's lockable, if it's tethered, the serial #, model number and many other important facts. This will help you with different things you want to do with your cellular device.