How is S.A.R. measured on a cell phone?
When a call is made or received there is a band of radiation from the antenna, half of which disappears into space. The remaining radiation is around the skull, face and ear area of the user and runs through the circuitry of the phone when transmitting the call. A dummy head is immersed in a gel-like solution similar to body fluid and a cell phone is attached to the ear. Readings are taken from the antenna to determine the S.A.R. strength which will vary from phone to phone and proximity to the closest signal tower.
