Of course, it will definitely affect your mobile specially that mobile mining is very extensive and it requires a lot of power of your mobile. That's why in the beginning, everyone thought that mobile mining is good. But in the end, it can do more harm that good. Specially your battery might be affected and who knows, what other programs are being accessed by this mobile mining. Unless you have a specific mobile phone dedicated to mining, but still though, they wanted higher specs which means you need to buy the latest mobile and it might not be a good investment after all.