  In this study, we analyzed one month of Call Detail Records, covering
Budapest in June, 2016. During this observation period, the 2016 UEFA European
Football Championship took place, where the Hungarian national football team
did well, beyond expectations. This case study focuses on the fans' behavior in
Budapest, during and after the Hungarian matches, from the perspective of the
mobile phone network data. Tense rooting, joy of scoring a goal,
self-forgetting celebration because of winning the group. All of these have an
effect on the data, that can be simply revealed. We used descriptive
statistical methods to analyze the available data set, and managed to
demonstrate the potential of this kind of data at social sensing. We found that
the mobile phone network activity reflects the football fans' behavior, even if
the match is played in another country.
