There are a few reasons why your remote could not be working.An IR Remote Control sends out a signal using Infrared light. You cannot see this light with the naked eye, however, by using a Smartphone in camera mode you can see the signal.To check if your IR Remote is sending a signal, please follow the steps below:Open the camera app.Point the end of the remote control with the IR emitter at the camera lens.Look at the phone's screen. Press and hold one of the buttons on the remote control.If the remote control is sending a signal, you should see a light on the phone's screen when you press the remote's buttons.You can also test each of the buttons on the remote by pressing them one at a time and checking to see if you see a light from the emitter.If a light is present when no button is pressed, one of the buttons on the remote may be stuck and preventing other buttons from working. If this is the case:Remove the batteries.Press and release each button a couple of times to see if you can free the stuck button.Replace the batteries and test the remote again.If you continue to see a light when no button is pressed, the batteries will require replacing.If the remote still refuses to work, the entire handset may require replacement.