Every cell phone has a specific measurement of how much microwave energy from the phone can penetrate the brain. Depending on how close the cell phone antenna is to the head, as much as sixty percent of the microwave radiation is absorbed by and actually penetrates the head. It can reach from one inch to one and a half inches into the brain. High levels of RF are known to produce biological damage through heating effects, which are virtually the same effects that food undergoes when it is cooked in a microwave. It is not known and it has not been able to be proven that lower levels of RF can cause adverse health effects.
Radiation is invisible and intangible, entering and leaving our bodies without our knowledge.
Most of the suspicion and fear regarding cell phone usage and electromagnetic radiation is based on fear and the potential cancer risk. Another possible health risk involving digital phones is that they can cause interference with some pacemakers. Most pacemaker users are aware of the potential interference of electromagnetic devices. A digital signal from the telephone may confuse the pacemaker with a signal different from that which it is programmed to expect. Most pacemakers do not send a continuous pulse to the heart, so the potential interference is not life threatening.