San Francisco Department of the Environment

Is there a way to use my cell phone and reduce my exposure to radiofrequency energy?

Yes! Just keep a distance between your phone and your body.

All cell phones emit radiofrequency radiation, or RF energy, when connecting with a cell tower. RF energy can be absorbed by the brain or body; this is a cause for concern because the World Health Organization classifies RF energy as a possible carcinogen (cancer-causing substance).

Make easy changes that reduce your exposure to radiofrequency energy.

  • Use a headset or speakerphone, or send a text instead
  • Keep distance between your phone and body by using a belt clip or keep your phone in your bag
  • Avoid using your cell phone in areas with weak signal such as a subway or elevator

Additional Resources

Federal Communication Commision's guide to wireless device health concerns
World Health Organization's electromagnetic fields and public health factsheet
California Department of Public Health cell phone guidance


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