I've seen this come up a few times. What is it? A virtual os for your phone?

Yeah, think Pokemon Go but persona. Also so far it's Japan only

I believe you're thinking of Dx2 Shin Megami Tensei: Liberation. Persona O.A. is more along the lines of a series support app you can use to access news, giveaway events, conversations with characters through a Mementos exploration game, and other things like that.

I need my Engrish.