How to pair the PS4 controller to the phone and use Gear VR?
To pair the PS4 controller to your phone via Bluetooth, check the following
1. Make the bluetooth of the PS4 controller be in discoverable mode,
by pressing & hold on PS and share buttons at the same time,
until white light blinking from backside.
2. Turn on your phone bluetooth
search for "Wireless Controller"
Then select to pair