The rate at which radiation is absorbed by the human body is measured by the Specific Absorption Rate (SAR) and its maximum levels for modern handsets have been set by governmental regulating agencies in many countries. The increasing use of wireless equipment has also increased the amount of radiation energy to which human bodies are exposed. A common property that measures absorbed energy is the SAR value to determine the amount of radiation that human tissue absorbs.

There have been many studies of the biological effects of EM radiation, many of these have been inconclusive. 

Using the research available, the following observations can be made:-

● Electrical fields of intensity similar to that found in the proximity of overhead power lines, many cause psychological responses such as changes in complex reasoning.
● In every special condition as explained earlier, the human body's biological rhythm may be altered, and in animals it has been shown the intense exposure to radiation can slow down the production of the hormone Melatonin. Changes in the level of this hormone causes cancer.

● Acute radiation exposure in human subjects results in headache and alterations in visual responses evoked by the radiation.

● In the presence of intense radiation, human reproduction may experience behavioural deficiencies as well as retardation in development.

Due to the effect that EM radiation can cause, it is useful to measure and limit the amount of radiation emitted from cellular transceivers which may be used to transmit data or voice signals. In conclusion, the effects of EM radiation are only a threat if the dosage of radiation is very high. In the case of cellular transceivers the dose is not very high. Most of the latest studies that have been done on the subject, have returned inconclusive results.

Many companies are taking advantage of the public's fear by selling products such as shielding cases which enclose the cellular transceiver and shield the user from the majority of EM radiation emitted by the phone. These tend to decrease the reception capability of the phone units.