I am not so sure even with that Android-based mining with Bitcoin. As of now, this is still impossible but in the future who knows Apple people might be interested to develop one that can take advantage of any mining opportunity not just limited to Bitcoin. I heard of a phone being developed by Sirin Labs and in fact they have an ICO for that. Just search on Google to get more information about that nice project. It would really be nice if this thing can already be possible so that participation in Bitcoin mining will not be limited to those who bought the expensive mining rigs. And this can also be the way to spread more cryptocurrency awareness and adoption.