It's no longer a "conspiracy theory" ... now a massive, multi-year government study has conclusively proven that cell phone radiation causes brain tumors.
It also causes heart tumors, by the way, and now the entire cell phone industry is freaking out and attacking the science, claiming cell phones are perfectly safe and pose no risk.
http://biorxiv.org/content/biorxiv/early/2016/05/26/055699.full.pdf