Cardboard VR is compatible with a wide range of contemporary smartphones.
Google Cardboard's biggest advantage is its low cost, broad hardware support, and portability. As a bonus, it is wireless.
Using the phone's gyroscopes, the VR applications can track the user in 360 degrees of rotation.
While modern phones are very powerful, they are not as powerful as desktop PCs. But the user is untethered and the systems are lightweight: