Using Samsung Gear VR (V3/2017) as FPV goggles. Minor modifications to allow Gear VR to be used with UVC/USB type receiver that is powered by the phone. Testing of Android apps in my case revealed FPViewer Premium ($4) to be only app to work reliably.
Gear VR 2017: http://a.co/1GJRMqR ($102)
UVC 5.8G FPV Receiver: http://a.co/854JchJ ($31)
FPView Premium/Pro app: https://play.google.com/store/apps/details?id=labsp.android.viewer&hl=en
