Coscia, MicheleHausmann, Ricardo2020-11-232015-12Coscia, Michele, and Ricardo Hausmann. “Evidence That Calls-Based and Mobility Networks Are Isomorphic.” CID Working Paper Series 2015.309, Harvard University, Cambridge, MA, December 2015.https://nrs.harvard.edu/URN-3:HUL.INSTREPOS:37366341Social relations involve both face-to-face interaction as well as telecommunications. We can observe the geography of phone calls and of the mobility of cell phones in space. These two phenomena can be described as networks of connections between different points in space. We use a dataset that includes billions of phone calls made in Colombia during a six-month period. We draw the two networks and find that the call-based network resembles a higher order aggregation of the mobility network and that both are isomorphic except for a higher spatial decay coefficient of the mobility network relative to the call-based network: when we discount distance effects on the call connections with the same decay observed for mobility connections, the two networks are virtually indistinguishable.en-USResearch Paper or Report2020-11-23