In case you were suspicious about cell phones, it looks like you had good reason to be. Recent, comprehensive epidemiological data has demonstrated that cell phone use for 10 years or more doubles your chance of getting a brain tumor on the side of the head that you put the phone close to. It’s really amazing how far common sense gets you. Common sense tells you that if you can fry an egg on your ear after a phone conversation, then maybe that’s not going to be the best thing for your brain. But somehow we are convinced of the safety of these things. Companies that have financial interests submit safety data and our government makes decisions based on these. My advice is to keep cell phones as far away from you as you practically can. When talking use the speakerphone or car bluetooth and hope for the best.
 
Surg Neurol. 2009 Sep;72(3):205-14; discussion 214-5. Epub 2009 Mar 27.