In the past few months, we have covered plenty of decent virtual reality and 3D content viewers for smartphones. Many of them are bulky though. SMARTvr has a foldable, compact design, so you can use it to view 3D content on your phone and put it in your pocket when finished.
SMARTvr is designed to support a variety of iOS and Android devices. It comes with 34mm Google Cardboard certified lenses. The cover protects the lenses from scratches. This VR viewer is available for under $35 at this time.[where to get yours]