To take photos on an iPhone through the Detrack app, permission must first be granted. If you had tried to take a photo from the Detrack mobile app on your iPhone but discovered that the screen is black, it is most likely that permission has not been granted to allow the app to access your phone’s camera.

To rectify this, go to Settings on your iPhone > Settings (scroll down to look for the Apps section)> Camera (ensure that this option is checked). After enabling, kill the app and reboot the phone.