I will give three crypto currencies to comfortably mine on your phone without much hazel.
1. Phoneum: you just need to download the app, register and start mining on a seven days circle, after which you can click to start mining again.
2. Pi: Pi is quite popular, I'd be surprised if you haven't started mining Pi already, I you haven't, just download the app and start mining ASAP.
3. Time: this is relatively new, I started mining Time last week, it is just like Pi, just that the process I simpler as compared to Pi mining.
You can hit me up privately if you need more help on mining Time.