Using your samsung galaxy note 4 as a flashlight can definitely be useful. Getting to this feature on your note 4 is a bit tricky since the option does not show up anywhere in the settings. To use the flashlight on your note 4 you have to add a widget that will enable this feature. To add a widget simply hold down anywhere on the screen until the widget option appears. You should be able to find the widget labeled as flashlight on the second page of options. Simply hold down on the flashlight widget and drag it onto any empty screen. Once you have the widget on one of your screens all you need to do is click on the option and the back of your samsung galaxy note 4 will light up in the back as a flashlight.