The aim of this article is to develop a methodology for compiling population density and mobility maps based on the data (geographic data) obtained from mobile operators in Irkutsk. Before its development, Russian and world experience in compiling maps based on mobile phones data was analysed. To achieve the aim, the author uses the data received from mobile operators (CDR), with which it was possible to identify information about the location of the device at any time. Based on the geographical location of base stations, one can analyse the density of users at a particular time and place. Based on the results of spatial data analysis, we obtained the signal density at a particular time. The results obtained now clearly demonstrate that geographic data from user devices and geographic information systems represent a very effective symbiosis of technologies, which serves for solving geographical problems. Such studies assess the general mobility of population for a particular region. Data on the location of a mobile phone can reveal the spatiotemporal distribution of urban residents at macro-and meso-levels in administrative districts of the city.