Three years ago, San Francisco passed the Cell Phone Right to Know Act, requiring phone sellers to tell consumers about safer uses of phones prior to purchasing them. At that time, Israel, U.K. and France had taken similar steps and the average age at which a child got a cell phone was 16; today most 10 year olds have phones. New scientific studies published since 2010 only strengthen the case for giving people information about ways to reduce their exposures to microwave radiation. Now all smart phones actually contain warnings, often deeply embedded within the devices themselves that are worded like those that the city proposes to make public through this law.