We really don’t know how bad they are for our nervous system.
1. Cell phones emit radio frequency energy (radio waves), a form of non-ionizing radiation, from their antennas. Tissues nearest to the antenna can absorb this energy.
2. Radio frequency is a form of electromagnetic radiation. Electromagnetic radiation can be categorized into two types: ionizing (eg. x-rays, radon, and cosmic rays) and nonionizing (eg. radio frequency and extremely low frequency, or power frequency). Radio Frequency exposure from cell phones does cause heating to the area of the body where the cell phone is held (ear, head). However, it is not sufficient to significantly increase body temperature.
3. Cell phones contain powerful batteries that emit a magnetic field.