Swedish researchers found that 10 or more years of mobile phone use increase the risk in brain tumor and it was confined to the side of the head where the phone was usually held.
People are nervous after reading the news, which was widely reported in the world. CNN's is the best, I believe. But should we give up phones? no, of course not.
First, the researchers are just mentioning Analogue phones. Now most phones we use is digital ones. The two kind of phone are using different kind of methods to transmit the signals, according to CNN. (I am surprised to find that some newspaper didn't mentioned this point at all; really embarassed for that reporter)
Second, they are saying that less than 10 year's usage will be less dangerous and they are still working out.
So I would like to suggest people not to put the phone near the head directly. Instead, using hands-free or microphone will be better.