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We present a mobile crowdsensing approach for urban WiFi characterization that leverages commodity smartphones and the natural mobility of people. Specifically, we report measurement results obtained for Edinburgh, a representative European city, on detecting the presence of deployed WiFi APs via the mobile crowdsensing approach. They show that few channels in 2.4GHz are heavily used; in contrast, there is hardly any activity in the 5GHz band even though relatively it has a greater number ofdoi:10.1109/noms.2014.6838233 dblp:conf/noms/FarshadMG14 fatcat:l5xgmli7mjhjvcomdbqvqkbece