The London Department of Health wanted to launch a campaign to fight obesity, by encouraging people to walk more. 
Taking into consideration that there have been many campaigns against sedentary lifestyle, we needed to find a very notorious and unconventional idea: something unexpected and that really called everybody’s attention. 

When people talk on their phones, they walk. That’s why we decided to create a mobile phone based campaign: Calories. 
The system measured how much does each person walk using Geo-localization, and we made a one-pound discount on their phone bill per mile walked.

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