First of all, it does happen that you get burnt cheeks from being on the phone for a long time. After all, mobile phones are also electrical appliances, and the operation of electrical appliances will generate heat. In addition, mobile phones are now designed with more and more functions and the internal space is getting smaller and smaller. How to dissipate heat is also a key consideration for every manufacturer. When using a mobile phone for a long time, the temperature of the mobile phone itself will indeed rise. When the temperature exceeds the tolerance of the skin, burns will occur.
Secondly, there is the issue of radiation. Mobile phone radiation is non-ionizing radiation, which is different from the ionizing radiation that we often say is harmful to the body (such as X-ray machines (medical equipment), nuclear radiation, etc.). And long ago, the World Health Organization made it clear that there is no evidence that the use of mobile phones will cause any adverse health consequences.
Furthermore, even if cell phone radiation can cause temperature to rise, according to IEEE safety standards, the threshold for local temperature rise in the human body does not exceed 3.5°C. If the normal temperature of the human body is 36.5 ℃, the local temperature cannot be higher than 40 ℃, and the maximum temperature caused by mobile phone radiation is less than 37 ℃, which is within a safe range. Moreover, humans can also adjust their own local temperature through the flow of their own body fluids. . Therefore, the basis for saying that radiation causes temperature increase is not sufficient.