Why I need to put my phone to Gear VR to debug google cardboard app?
I am using Unity3d and when I press Export & Run after the loading my phone asking me to connect my phone to the Gear VR.
The app is only for Google Cardboard!
You have to disable vr mode to build for cardboard. Go to Edit > Project Settings > Player > Other Settings and make sure to remove the checkmark next to Virtual Reality Supported. Also make sure to use the Cardboard Prefab for Unity to replace the camera.
Unity has announced to support Cardboard without plugins in the future, so this special setup will most likely no longer be necessary.