'They demonstrated that old smartphones can be successfully repurposed into tiny data centers capable of efficiently processing and storing data. ...

These tiny data centers have a wide range of applications. For example, they could be used in urban environments like bus stops to collect real-time data on the number of passengers, which could then be used to optimize public transportation networks.'

https://techxplore.com/news/2025-06-smartphones-life-tiny-centers.html