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OpenCellID is the biggest open source database of Cell IDs (GPS positions of GSM cell towers) and is generated by a community similar to the OSM community.

The community mainly uses smartphone apps for contributing cell-id information to OpenCellID.

More than 26.400.000 cells have already been discovered worldwide, with more than 1.600.000.000 measurements (04/2016)

On you can find the data, on lots of information related to OpenCellID is available.

Data is available both from the API or downloadable completely as CSV files.

A German, English, French, Spanish and Polish version is available.