Cell phones transmit information through electromagnetic waves, and these waves are known as cell phone radiation. The marathon debate on whether cell phone radiation is harmful to humans has never stopped. The size of cell phone radiation mainly depends on its antenna, appearance design and other factors, in actual use, the size of cell phone radiation is also related to the distance between the phone and the base station, the geographic environment around the user, the setting of the base station and other factors. Generally speaking, the closer the cell phone is to the base station, the smaller the radiation will be, and vice versa, the greater. The frequency used by cell phones belongs to the microwave, and the strength of the emitted signal varies in different states. Such as cell phones into the network when you need to establish contact with the base station, transmitting signal power; in the subway, elevators and other places, because the wireless transmission signal between the phone and the base station attenuation is very large, the signal becomes weak, then to protect the quality of calls, power control technology will make the phone’s transmitting power increases, the radiation impact is relatively large. Therefore, in life we have to put an end to the following situations: 1, private calls “to hide in the corner to say quietly” In general, the signal coverage in the corner of the building is relatively poor, so it will, to a certain extent, make the radiation power of the cell phone increased. For the same reason, in the elevator and other small and closed environment, should also be careful to play cell phones. 2, hang the phone on the neck or waist According to experts, the radiation range of the cell phone is a ring with the phone as the center, the distance between the phone and the body determines the degree of radiation absorbed by the body. Therefore, people and cell phones need to maintain the “beauty of distance”. The healthier and safer way is to put the phone in the bag you carry with you and try to put it in the outer layer of the bag to ensure good signal coverage. 3. Hold the phone close to your ear when the call is not connected. When the phone is dialed and not connected, the radiation will be significantly enhanced, so you should keep the phone away from your head and talk again after an interval of about five seconds. 4, the weaker the cell phone signal, the closer the ear. When the cell phone signal becomes weak, many people will instinctively put the phone as close to their ears as possible. However, according to the working principle of cell phones, in the case of a weak signal, the phone will automatically increase the electromagnetic wave emission power, making the radiation intensity significantly higher. At this time, the ears close, the radiation to the head will be multiplied. 5.Walk east and west, move frequently. Some people like to unconsciously pace the square, walk frequently when playing cell phones, but do not know that frequent movement of position will cause the strength of the received signal fluctuations, thus triggering an unnecessary short period of high power emission. In addition, in a moving car to call a cell phone, the phone may be too frequent to avoid switching areas, and specify a wider coverage of high-power base station to provide services, its transmission power will be increased by the increase in transmission distance.