Question How to use a mobile phone for a good purpose (or for my own benefit) while traveling?

[Matiseli]

Hello, I'm looking for an application with these requirements: that I don't have to interact with the mobile and at the same time do something useful (for community, people, planet,...) thanks to it. For example, I know "the EPP" app which is a kind of digital pedometer where you get points for physical activity that you can then donate to various good projects. Unfortunately, the app is poorly designed and full of bugs, so I'm looking for an alternative.
If there isn't one, isn't there at least an app that can be of some use to me? I can think of letting my phone mine bitcoins while I have it in my pocket. But maybe it's stupid idea.
Thanks for the ideas.