The City of Berkeley requires that customers be provided the following notice:

To assure safety, the Federal Government requires that cell phones meet radio frequency (RF) exposure guidelines. 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 radiation. Refer to the instructions in your phone or user manual for information about how to use your phone safely.

http://arstechnica.com/tech-policy/2015/09/city-of-berkeley-fends-off-wireless-industry-suit-over-health-warning/

Consumer Reports - Does Cell-Phone Radiation Cause Cancer?
Consumer Reports agrees with concerns raised by the American Academy of Pediatrics and the Government Accountability Office about the tests, and thinks that new tests should be developed that take into account the potential vulnerability of children.

http://www.nbcbayarea.com/video/#!/on-air/as-seen-on/Report-Examines-Cell-Phone-Radiation/329417991

http://www.consumerreports.org/cro/smartphones/cell-phone-radiation

Karl Maret, MD, Expert Forum on Cell Phone and Wireless Risks (10 min)
Dr. Maret talks about the risks to children in Wi-Fi classrooms, presenting case studies involving real-time, continuous dossimetry measurements, including cumulative exposures and the percentage of each school day unacceptable exposure levels occurred.

https://vimeo.com/132039697

EHT Lauds Israel's Ban on Wi-Fi in Kindergarten and Limits to Children’s Wireless Exposures in Schools

Guidelines for the installation and operation of Wi-Fi networks in schools: Following a petition seeking an outright ban on Wi-Fi in Schools, the government is banning Wi-Fi in kindergartens and restricting hours of use in schools, installing equipment with exposures to be set as low as possible, and monitoring radiofrequency (RF) radiation levels.

http://www.sbwire.com/press-releases/eht-lauds-israels-ban-on-wi-fi-in-kindergarten-and-limits-to-childrens-wireless-exposures-in-schools-627333.htm

CMAJ (Canadian Medical Association Journal): Parliamentary report calls for action on Wi-Fi
The federal government should “develop an awareness campaign relating to the safe use of wire-less technologies, such as cellphones and Wi-Fi, in key environments such as the school and home” while considering “policy measures regarding the marketing of radiation-emitting devices to children under the age of 14, in order to ensure they are aware of the health risks and how they can be avoided.”