MicroG has a unified network location provider that accepts backends for the actual location lookup. This project implements a cell-tower based lookup for your current location. It ships a binary cell database extracted from opencellid and thus licensed under the CC-BY-SA license. Review the following content for details:
This "NetworkLocationProvider" works without network connectivity and will never post your data anywhere. You are thus encouraged to help opencellids to gather more cells in order to improve this project.
This software includes "XZ for Java". The files were put into public domain and licensed as "do whatever you want with these files". You are thus free to take everything under src/org/tukaani and treat it as public domain.
This software is licensed as "Apache License, Version 2.0" unless noted otherwise.