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.
Yeah smartphones are not capable of mining, mining nowadays is not possible or is useless with the simple CPU, Gpu are used for mining and even the old models of GPU are not efficient for mining. Smartphones are only capable of communication no matter how strong their processor are. You will not be able to fulfil the power need for mining, the batteries of smartphones can not run more than 4 hours of continuous use within a few months.