I would say the evidence on the damaging effects of cellphone and other wireless radiation is as strong, if not stronger, than the evidence on climate change, which I've reviewed as a member of the IPCC.
I would also add that's the reason why Lloyd's of London and Swiss Re, in 1999, refused to cover health damages from cellphones. There is obviously a concern there.
I would further point out that there is advice inside the phone that tells you this, if you know how to find it. I would say with the evidence on the causal effect of mobile phone radiation on sperm, on pregnancy, on hearing, and on cancer—including acoustic neuroma, which is a tumour of the hearing nerve, and on leukemia, which we have less firm evidence on—there's growing evidence showing a causal impact, yes.