I'm not a big fan of mobile mining apps even though my only experience with one was overwhelmingly positive. I recall back in the day when Litecoin was first released. I downloaded some sort of Litecoin solo miner on my old iPhone and actually managed to mine a block. I remember thinking it was pretty cool, but back then it wasn't exactly winning the lottery and I was worried about overheating damage to my phone so I stopped. Looking back, I should've probably bought 100 more phones and had them all solo mining. LOL
Mobile mining used to work fine years ago but now it's too weak for the tougher challenges and phones can't handle it. Overheating and battery issues make it risky and most apps today barely pay or turn out to be scams. For real profits, ASIC or GPU rigs are the way to go. Mobile mining just doesn't cut it anymore.