That is right. You can use your cell phone (S5, S6 etc) as a Virtual Reality device. All you need is an app and software for your Windows P.C. You will still need a headset that you can wear and put your phone in like Gear VR or Google Cardboard.
Trinus
Here is a You tube video showing what it is like.
Check them out at: http://trinusvr.com/