Most of the mobile mining app are scam and you can hardly find a real one. If you really want to mind then it's better to choose computer to mine or even better spend money to buy mining gear although you will have to spend money to setup a mining rig. It might not be good for some people in a country where electricity isn't cheap so, if you don't want to spend so much money then you should try different ways to earn cryptocurreny. For mobile mining app is that you should stay away from it.