Displays nearest GSM cells around you. This layer is based on the open sourcedatabase from http://www.opencellid.org/

Displays nearest GSM cells around you. This layer is based on the open sourcedatabase from http://www.opencellid.org/.

But what is a CellID?: a CellID is the unique number of a GSM cell for a given operator. Your phone is always connected to a Cell, and by nowing this number, you know the Cell, and by knowing the position of the cell, you know where you are. There is some accuracy issue, as the cell can cover from several hundreds of meters to several kilometers, but this could be a very good starting point to locate yourself.