assuming it’s at the phone’s resolution then you can’t increase it without AA, which you’re using. it’s possible that your frame rate isn’t dropping enough for temporal AA to make a difference, if it is working. it’s also possible that you just need more MSAA. the resolution of the OnePlus5 is 1920x1080, which is then cut in half to give you 960x1080. that’s definitely a low resolution but i haven’t used phone VR and so i don’t know how it feels in game.