We haven't had this discussion in a while. There's always the crowd who says "it is impossible for a cellphone to affect your body except by heating", the crowd who says "it'll give you cancer", and a few who say "we're not sure why there are effects, or what their significance is, but they do exist". This article falls into that last camp.
...Horne and his colleagues controlled a Nokia 6310e cell phone - "another popular and basic phone" attached to the head of 10 healthy but sleep-deprived men in their sleep research lab. (Their sleep had been restricted to six hours the previous night.) The researchers then monitored the men's brainwaves by EEG while the phone was switched on and off by remote computer, and also switched between "standby," "listen" and "talk" modes of operation for 30 minute intervals on different nights. The experiment revealed that after the phone was switched to "talk" mode a different brain-wave pattern, called delta waves (in the range of one to four Hertz), remained dampened for nearly one hour after the phone was shut off...
I'm not related to the Mr. Horne mentioned in the article.
Bill Horne Temporary Moderator
(Please put [Telecom] at the end of the subject line of your post, or I may never see it. Thanks!)