Real world examples are Pokemon Go, and Google Glass

In this story AR is pretty wide-spread and AR headsets (super lightweight glasses of some kind with a small earpiece & mic, with minimized touch controls on the outside of the earpiece) are really common. Some people use only an AR headset instead of a smartphone, and they're not that uncommon.

Augmented Reality sits on top of the real world as kind of a plane of existence that very physical beings can't see or interact with without a headset, but ghosts, psychics, and other ethereal creatures can interact with it directly and see it normally.