The city council of Berkeley, California, voted Tuesday night to pass a cellphone right to know" law requiring health warnings with the purchase of a cellphone. When it goes into effect this summer it will be first safety ordinance of its kind in the country. Cellphone retailers will be required to include a city-prepared notice along with the purchase of a cellphone, informing consumers of the minimum separation distance a cellphone should be held from the body. The Federal Communication Commission recommends keeping your phone 5 to 25 millimeters away, depending on the model, to limit radio frequency (RF) exposure to safe levels. "If you carry or use your phone in a pants or shirt pocket or tucked into a bra when the phone is ON and connected to a wireless network, you may exceed the federal guidelines for exposure to RF [radio frequency] radiation," the Berkeley safety notice reads. "This potential risk is greater for children." Lawmakers in at least six states have also considered warnings to address cellphone radiation concerns. The Berkeley proposal seeks to address concerns that even as cellphones become ubiquitous in our lives, many people remain unaware of basic safety recommendations. An April 30th survey funded by the California Brain Tumor Association (CABTA) found that 70 percent of Berkeley adults did not know about the FCC's minimum separation distance.