Cell phone radiation levels

by Nicole Lee

What it all means

According to the Cellular Telecommunications Industry Association, specific absorption rate, or SAR, is "a way of measuring the quantity of radio frequency (RF) energy that is absorbed by the body." For a phone to pass FCC certification and be sold in the United States, its maximum SAR level must be less than 1.6 watts per kilogram. In Europe, the level is capped at 2 watts per kilogram while Canada allows a maximum of 1.6 watts per kilogram. The SAR level listed in our charts represents the highest SAR level measured with the phone next to the ear as tested by the FCC. Keep in mind that it is possible for the SAR level to vary between different transmission bands (the same phone can use multiple bands during a call), and that different testing bodies can obtain different results. Also, it's possible for results to vary between different models of the same phone--such as a handset that's offered by multiple carriers. CNET lists the exposure for voice calls only; the SAR for data use can differ.

It's important to note that in publishing this list, we are in no way implying that cell phone use is harmful to your health. Research abounds, but much of the literature is contradictory. While some researchers have said there is cause to be "concerned," others disagree and say it is still too early too early to be alarmed. Similarly, though some tests have suggested a link between long-term (10 years or longer) cell phone use and cancer, there still is not conclusive or demonstrated evidence that cell phones cause or don't cause adverse health effects in humans. In short, the jury is still out. Research into the matter will continue, and we will continue to monitor its results.

If you're concerned about limiting your SAR exposure, you can take a few easy steps beyond purchasing a handset with a low SAR. You can text instead placing a voice call, use a speakerphone whenever possible, and carry your phone at least one inch from your body. Some researchers also caution against using your phone in areas with poor coverage since phones emit more radiation when searching for a signal. Children, which have smaller and thinner skulls, should limit cell phone use, and all users, children and adults, should not sleep with an active phone next to their bedside or under their pillow.

Note that simply using a headset won't free you from cell phone radiation. Studies have shown that radio signals tend to follow up wired headsets to the ear, and even though Bluetooth headsets emit far weaker radiation than cell phones, there's still a small amount being transmitted.

If your phone isn't listed here (U.S. customers) and you've purchased it within the last few years, consult your user manual. Alternatively, you can request the SAR information from the FCC, the manufacturer, or your carrier. You'll need the model number and FCC ID number, which is usually--but not always--listed in the owner's manual or under the phone's battery (you must pop the battery out). We'll continue to update the list as new phones are announced. To be the first to know when we've added more phones, subscribe to the CNET Mobile Weekly newsletter. For more information, consult the Food and Drug Administration or the Environmental Working Group.

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