Whether, and if so, how dangerous smartphone radiation actually is during a call has not yet been conclusively clarified. As a precaution, however, there are limit values that manufacturers must observe. Because one thing is certain: mobile communications use high-frequency electromagnetic fields, some of the energy of which is absorbed by the head when on the phone.
This is called Specific Absorption Rate (SAR), which is measured in watts per kilogram. The limit for smartphones is 2 watts per kilogram.
No smartphone is critical, so there is no need to worry. However, if you use your smartphone to make a lot of calls and want to be absolutely sure that you receive as little radiation as possible, below you will find 15 tested smartphones from the best CHIP list with the lowest SAR values. list.