It won't happen.
Smartphone for bitcoin mining? you are just destroying your phone.
Smartphone as digital wallet, you can simply download an app / wallet and that's how you make it as your wallet.
Really? I once knew, my friend uses his smartphone for mining cryptocurrency. But, need to know the smartphone is only has a small strength when compared with miner and computer. And mining using a smartphone will be very burdensome smartphone that leads to damage. To my knowledge other than smartphone can be used for mobile wallet can also be used for mining.