[adrianN]

I'm fairly sure that cell phones are mostly harmless, but the argument that the radiation is not ionizing is a poor one. We know that tissue absorbs some of the radiation, with a fairly strong dependence on the frequency. Biological systems are messy and poorly understood and I find it plausible that slightly wiggling the molecules around disturbs some reaction pathway or other. Given the prevalence of cell phones thoroughly testing this hypothesis is totally warranted imho.

[freyr]

Cellular radiation is tested very thoroughly. So far, the only observed effect is a slight thermal effect at very high received power, as we'd expect.

We can't prove it's completely safe, but nobody yet has been able to demonstrate any compelling evidence that it's unsafe.

[adrianN]

Yeah, those experiments are why I'm pretty sure that cellphones are safe.