Electroneum miner is a simulated miner, meaning you don't really use your mobile's processing power to get those coins.
However, Another close Competitor of etn is Stellite(xtl) which has plans to integrate real mobile mining which only uses a part of your proccessing power without affecting the system performance.Yes, it does sound impossible,but they are doing it and testing it.
PS: the Stellite Core developer is an Indian