There are plenty of affordable VR headsets available for smartphones. HoloKit is developed for mixed reality applications. It has a 76-degree field of view to merge real and virtual worlds. HoloKit puts virtual objects around you as if they were physically there. They stay in the same place even if you walk away.
The kit is compatible with iPhone 7, iPhone 7 Plus, ASUS Zenfone AR, and Lenovo Phab 2 Pro. The above video shows what you can do with it.