My understanding is it simulates mining. So therefore no resources used on your phone. They just look at the specs of your phone and you get tokens based on that. It is essentially still mining, just a simulation of it. As long as you get tokens for using it that is what mattters. Better to mine like this than melt your phone.
The actual mining will be on PCs.
i'm good in playing a simulation flying game ,so..i 'm a pilot that can fly a real airplane now!