This app will allow you to send commands to your GrayTile GT001-N device by converting your button presses inside the app to an SMS command to be sent to your device. After a command button is pressed, it would open up the default SMS application, that the phone is using, pre-filled with the SMS command text and you device's phone number as the intended SMS receiver. Once you press the send button from your SMS application, the desired command would be sent. The responses from the device would be received as SMS.