2015 2016 2017 Figure B.4: Expansion of the cell tower network of MPT. The blue dots show locations of cell phone towers that are added to the data each year, and the black dots show locations of the pre-existing cell phone towers. Number of cell phone towers 15000 14350 15000 9941 10000 10000 8836 5000 5000 5 0 MPT mno1 mno2 mno3 Mobile network operator 5 0 mno4 2009 2011 2012 2013 2014 2015 2016 2017 2018 2019 (a) Number of cell towers by provider (b) Creation of cell towers over time Figure B.5: Panel (a) presents the total number of cell phone towers by mobile network operator. Panel (b) shows when cell towers were reported in the OpenCellID data. 30

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