Radio Frequency from cell phones comes from the antenna, which sends signals to the nearest base station. More far the cell phone is from the nearest base station, the more radiation it requires to send the signal and make the connection. As a result, scientists theorize that the health risks from cell-phone radiation would be greater for people who live and work where base stations are farther away or fewer in number—and research is beginning to support that theory.
In December 2007, Israeli researchers reported in the American Journal of Epidemiology that long-term cell-phone users who live in rural areas face a "consistently elevated risk" of developing tumors in the parotid gland compared with users who live in urban or suburban locations. The parotid gland is a salivary gland located just below a person’s ear.
And in January 2008, the French Health Ministry issued a warning against excessive cell phone use, especially by children, despite the lack of conclusive scientific evidence linking cell-phone use with cancer or other serious health effects. In a public statement, the ministry said: "As the hypothesis of a risk cannot be entirely excluded, precaution is justified.
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General recommendations to minimize the potential health risks include talking on cell phones only when necessary, and using a hands-free device to keep the cell phone away from your head.
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