Mining cryptocurrencies in smartphones can be done since years, but it has never been really developped, mostly because of devices prices and low performances. I've been always worried about this kind of mining, because mining on a mobile device can be dangerous with the lithium battery which is stressed by heat and abusive plugging time.
We all know what happens to a defective lithium battery : burning or explosion.

I wouldn't try if I would like to keep my device alive a long time