Ok, but why the electroneum app says that you can mining from there app? Is actually very confusing, I'm not a expert but from what I know you need a good video card for all the mining you made, still very confusing.
Note: I'm now is this and today I'm thinking to spend 800€ only for video cards, if you can help me I can tip you, thank you.
For the desktop there's an app called Minergate, which allows you to mine certain coins with your CPU and video card.
You won't earn much with it, but I've used it with succes in the past to mine bytecoin and made around 0.025 BTC after mining a couple of weeks.
You have similar apps for Android, but they're definitely not worth it, you'll overheat your phone and won't earn anything.
