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Editorial
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Volume 344:133-134 January 11, 2001 Number 2
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Cellular Telephones and Brain Tumors

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by Inskip, P. D.
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Cellular telephones are low-power radio devices that transmit and receive electromagnetic radiation at frequencies of about 1000 MHz, just above the ultrahigh-frequency (UHF) television portion and just below the microwave part of the electromagnetic spectrum. These three frequency ranges are within the radio-frequency zone of that spectrum. Cellular telephones operate at a lower power (less than 1 watt) than police or other emergency-communication devices. Cordless telephones, which have a base unit that is wired to a conventional telephone service, operate at a lower frequency and power than cellular telephones; they cannot be classified as a type of cellular telephone.1,2

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