OpenCellID is an open source project, aiming to create a complete database of CellID worlwide, with their locations. Project will provides free access to tools, data to not only create this database, but also retrieve location information. A CellID is the unique number of a GSM cell for a given operator. Your phone is always connected to a Cell, and by knowing 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.
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