Google Cardboard
Cardboard is a beginner's virtual reality experience that knows it's a beginner's virtual reality experience. That has its pros and cons. First, the great things: Google Cardboard is cheap, the platform works with both Android and iOS devices, and there’s a lot of content available.
It's also dead-simple. You download the Cardboard app, put your phone in a cardboard viewer tricked out with a pair of magnification lenses, watch a demo experience to get the hang of it, and then hit up the Google Play Store’s Cardboard section to expand your VR library. You can even make your own immersive experiences easily with the free Cardboard Camera app. Most titles for Google Cardboard are free. The rest are cheap.