Sperm reduction: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4074720/
http://www.ncbi.nlm.nih.gov/pubmed/21799142
Cell phone heat affect
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3538231/
http://jama.jamanetwork.com/article.aspx?articleid=645813
I'm not saying it definitely causes DNA breaking, or definitely causes cancer, or whatever. I'm saying there is evidence that it is harmful. High doses of energy into your brain as heat is not fully understood yet. There are affects of the heat and EMF on sperm, we need to study more the long term effects on the brain.