“Utilizing Wi-Fi technology within the infrastructure of the now tech-equipped trashcans, new ‘Renew Pods’ spy trashcans have been placed throughout the financial district of London. The ‘Renew’ company behind the spy cans says that the Renew Pods track and collect a medley of information. Specifically, it includes your phone’s unique Media Access Control (MAC) address, which these Renew Pods collect without even the slightest warning. But that’s along with collecting other characteristics that are used to sell to advertisers in order to better ‘target’ you with advertising in the area.”
http://www.storyleak.com/wi-fi-trashcans-tracking-your-smartphone-data/