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It can be, but sill it has not been proven.... the most simple thing to do is when you sleep, out off your cellphones in the night.

Yes the researcher found it. It should be limited use and be careful. 

There have been concerns about cellphone links to cancer since the 80s and no significant rise in brain cancers have been seen. No worried, just researchers attempting to justify their salaries!

This is one of those topics that we will not know the results until it is too late.  If there is a problem, we will all be fried long before we know it.