[mcbits]

Fire cooks food, but waving your hands above a candle for warmth doesn't "cook" your hands. However, if you do damage your skin (especially repeatedly), the tissue damage and repair cycle can increase the risk of cancer.

So when it comes to cell phones, do those microwaves merely warm human tissue very slightly, or might it occasionally be concentrated in a way to cause micro-burns? Supposing the body is repeatedly having to heal tiny microwave burns, it wouldn't be surprising at all if cancer risk is increased.