May I please have a list of vr sets that are compatible with VO or if it is only the gearvr set that works.

**I am currently playing on a Samsung grandprime but willing to upgrade if I must

To my knowledge, the 2 VR headsets that currently work with VO are:

Gear VR (must have better than a Note 4; you will need a S6, S6e, S7, S7e, or Note 5).
Oculus Rift

edit 3/29/17: it's now also out for Daydream:
https://play.google.com/store/apps/details?id=com.guildsoftware.vendettahd&hl=en