Yes it is. I am not sure when, if ever, Epic will get spatialization through Oculus Audio SDK working on Android 
So it’s useless to check the oculus audio plugin without having FMOD, isn’t it?
Do you have some good examples for spatialized sound in Android apps?
What plugin? The one in UE4? That one doesn’t do anything anyway for Gear VR.
You have to have FMOD and you use Audio SDK plugin for FMOD on top of that to get spatialized audio in Gear VR.
I don’t know specific examples, but as you can hear sound spatialized in real life, you can hear something similar when using spatializer in VR (you can determine direction, distance and a bit of elevation of the sound source in your VR scene).
Also if you have enough hardware resources you can use reverb and occlusions.
To get you right , I need to buy the FMOD Studio with the Indie license and then get the Oculus audio plugin to be able to use spatialized sound on my Android app?
Sorry for my dump questions but this is the first app that I am creating, so this is all new to me 
Did you check with FMOD’s website? For free projects it’s free. For initial commercial project for indies it’s free. So, if you go commercial, make sure your first project makes enough to may for FMOD license for the second project 