It's a shame that the app has been deleted by Google, but on the one hand, mining on smartphones is not a good alternative. I mined for some time using the Minergate App and heated the equipment a lot, so I left it on an aluminum plate to compensate (and in an air-conditioned room).
P.S. The air-conditioned room is used for another purpose, I was just taking advantage to expand the use.
mining JSECoin is different and consumes much less resource than others.