1. Pair the two smartphones via Bluetooth.
2. Open the Daydream app.
3. Tap the menu button (upper right, three horizontal white lines).
4. Tap Settings.
5. Tap “Build Version” 8 times – Developer Options should appear.
6. Tap Developer Options.
7. Tap Controller Emulator Device.
8. Select your other phone from the list and press OK.
9. Tap “Skip VR entry screens” and press OK.
10. Tap back, back until you get to the first Daydream home screen.
11. Tap the blue button with the viewer icon.
12. Open the Daydream Controller app on the controller phone.
13. Place the Daydream phone into a Google Cardboard viewer of some sort – or don’t, if you want to view without VR, for whatever reason.