http://io9.com/5807050/world-health-org ... chloroformInstead of storing phones in pockets or on belts, it's better to carry them in a bag or something that keeps them at least an inch from your body. (Both iPhone and Blackberry manuals already recommend this.) Also, the WHO recommends using "hands free devices" like headsets to talk on the phone, or texting rather than calling, both of which can help reduce risks for glioma.
And what about laptops?