Everyone knows how complicated it is to mine cryptocurrencies and how much energy the mining computers utilize to solve the mathematical problems to find new coins.
Just think on how GPU's and asic miners consumes energy just to mine though it's adjustable, you can also do the same thing if you'll mine with mobile. But for someone that has a very busy life to live on, you'll end up giving it up.
But do you think mining could ever be done on cell phones?
Yes it can be but not actually mining, it's like a virtual mining which the software most likely sees you mining but it really isn't it. Check ETN mobile mining.