However, most studies have examined the results of whole body exposure to RF fields at levels far higher than those normally associated with wireless communications. With the advent of such devices as walkie-talkies and mobile phones, it has become apparent that few studies address the consequences of localized exposures to RF fields to the head. The issue is whether the radiation cellphones emit can injure human tissue, because they are snuggled up against the ear, just millimeters away from brain tissue. The electromagnetic spectrum includes all sorts of radiation, from cosmic rays to visible light. Ionizing radiation busts up molecules and can definitely damage DNA, causing cancer and birth defects.
Ionizing radiation is, in fact, the only well-established cause of brain tumors.
It is microwave radiation. Yes, the same stuff you use for nuking leftovers. Only it is too low-level, it is said, to produce significant heating that could harm tissue. A British government commission warned in May that children should use mobile phones only when necessary. Restrictions like this would be a huge blow to the cellular industry.