A team of 31 scientists from 14 countries, including the United States, made the decision after reviewing peer-reviewed studies on cell phone safety. The team found enough evidence to categorize personal exposure as "possibly carcinogenic to humans."
What that means is they found some evidence of increase in glioma and acoustic neuroma brain cancer for mobile phone users, but have not been able to draw conclusions for other types of cancers
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 there still is not conclusive or demonstrated evidence as to whether cell phones cause adverse health effects in humans. While some studies have found a possible link between long-term (10 years or longer) cell phone use and brain tumors, decreased sperm count, and other ailments, other research has found no such effects. The science will continue, and we will continue to monitor the results, but it can take years of exhaustive research before studies actually prove anything (if they ever do).
If you're concerned about limiting your SAR exposure, you can take a few easy steps. You can text instead placing a voice call, use a speakerphone or headset whenever possible, and carry your phone at least 1 inch from your body (making sure the antenna is facing away from you). If you're pregnant, you should avoid carrying a phone next to your abdomen. Some researchers also caution against using your phone in areas with a weak signal since phones emit more electro-magnetic radiation during those times. Children, who have smaller and thinner skulls, should limit cell phone use, and people of any age should not sleep with an active phone next to the bedside or under the pillow.
BlackBerry Bold advises users to "keep the BlackBerry device at least 0.98 inch (25 millimeters) from your body when the BlackBerry device is transmitting."
The logic behind such recommendations is that the further the phone is from the body, the less radiation is absorbed. Users can also use the speakerphone function or a wired earpiece to gain some distance.
Users can text instead of talk if they want to keep the phone away from their faces.
Finally, cell phones emit the most radiation when they are attempting to connect to cellular towers. A moving phone, or a phone in an area with a weak signal, has to work harder, giving of more radiation. So users can avoid using their cell phones in elevators, buildings and rural areas if they want to reduce their exposure, experts say.