In an advisory, WHO has said, "Studies till date provide no indication that environmental exposure to radiofrequency fields, such as that from base stations, increases the risk of cancer or any other disease.
"Scientists have reported other health effects of using mobile phones, including changes in brain activity, reaction times, and sleep patterns. These effects are minor and have no apparent health significance."
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So, keeping in view of ever increasing mobile phone use and, therefore a potentially longer lifetime of exposure, WHO "has promoted further research... And is currently assessing the health impact of RF fields on all studied endpoints", states the advisory dated September 20.