Not saying it's true, but my father a couple years back got a cancerous tumor in his leg directly where he kept his cell phone in his left pocket, for around 25 years
I have a background in RF engineering. This is complete horse shit. Cell phones utilize non-ionizing radiation and cap out their power at a couple watts. Your lights are exposing you to more non-ionizing radiation (read: harmless).
The problem is that the effects can only be seen statistically. Individual instances always have multiple explanations. My take is that there is probably minor danger from having it close to vital organs. It's not hard to keep the phone away from your body for long periods, and use hands free when talking.
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