Enabling Gear VR Developer Mode on Android
It is possible to develop for the Gear VR without requiring the Gear VR to test the application. To do so, an application built with an Oculus Signature File has to be installed on the development phone. If no Oculus Signature File was found on the device, the You are not a developer message would pop up.
On the phone, navigate to Settings > Apps > Gear VR Service > Storage > Manage Storage . On this screen, Developer mode can be enabled under Developer Options. It is also possible to add a shortcut to this page to the apps list by selecting Add icon to app list.