On-Demand tracking or SMS mode is a mode of tracking that does not require an App to be installed. It's the simplest way of tracking the unit. This mode helps stretch the battery life of your unit to 5-6 days in standby under light use (calling maybe 2-3 times a day).
With On-Demand tracking or SMS mode, you simply call unit to track it using your mobile phone. The line would ring then disconnects and after few seconds you will receive a text message from the unit that contains the coordinates of its current location. If you are using a smartphone with data service, you can simply tap on the hyperlink or URL to view the location on a map. Otherwise, input the provided coordinates (latitude, longitude) on mapping software like Google Map to view the location.