The issue of human mobility and its relation to changing spatial structures of cities and regions is in front of researchers´ attention for several reasons. The first crucial emphasis is on environmental impacts of increasing population mobility and car use in metropolitan regions. The newly emerging forms of spatial organization represent a challenge for policy and planning, particularly in relation to environmental sustainability, smart growth, balanced economic development and human quality of life. The issues of social inequalities in everyday mobility represent the second key area of research attention. Mobility is seen as a form of capital which is unevenly distributed in the society. The abilities to move and to choose location of home, work and other activities significantly vary in society and this variation eminently impacts on daily life of individuals and households. Taking the dynamics of post-socialist transformation into account, it is legitimate to expect even deeper changes in mobility patterns and social inequality dynamics in CEE countries. To cope with the newly emerging conditions and processes and to design relevant policy and planning responses, a better understanding of the ways how cities and regions are internally organize and how people behave in metropolitan space is urgently needed. Therefore the main aim of the project is to investigate the daily mobility of urban population and its differentiation in relation to changing spatial structure of post-socialist metropolitan regions. The novelty of the project lies in the (1) utilization of mobile phone location data as an innovative data source, (2) analytical approach sensitive to environmental issues and social inequalities rooted in mobility, (3) stress on mutual relation between mobility, social differentiation and spatial patterns, (4) implementation of other activity stations to mobility scheme besides work and home, (5) focus on specific transition context in post-socialist countries.