Tower Collector is an app to help contribute mobile tower data to Mozilla Location Services and OpenCellID, so that its open to all instead of a few large companies. Both of them are open source projects.
This data can be used for estimating location without GPS for example.
Fdroid link
It is technically possible for Mozilla or OpenCellId to abuse this data but they're one of the only companies I kinda trust while being a privacy nerd. Also I assume they only store IP's privately and not in the public database.