Yes, in theory, bitcoin mining on an Android or iOS phone is possible using special applications that can be downloaded from Google Play or the App Store. But in practice, bitcoin mining on Android or iOS is not possible. This is due to the high power of the cryptocurrency payment network. As of 2020, the computing power of the Bitcoin network is 2.5 TH/s (2.5 trillion hashes per second). That is how much it takes to get a block and get a reward in the form of new issued coins. Whereas a modern smartphone is capable of providing a maximum computing power of 14 H / s. It is clear that this power is not enough to earn some decent amount, even if the phone will mine crypto around the clock for many years. Theoretically, modern smartphones could profitably mine bitcoins, but only if it were now 2010, when the power of the network was not yet so high. Today, bitcoin mining on an Android or iOS phone, even on the most modern models, is a utopia. But the developers of mining applications on Google Play and the App Store are trying to convince the opposite.