Increase the visibility of street children who work, or borrow money, on road signs. This was the need of Obra do Berço, a pro bono day care for children. Our idea was to install bluetooth antennas at some traffic lights. The antennas sent a message to the phones within 120 meters, as if one of the children at the traffic signal told them why they were there, asking for a donation. We have achieved a considerable increase in donations to the institution and won a Bronze Lion in Mobile at the 2013 Cannes Lions Festival.