付録/索引57maximum value. This is because the phone is designed to operate at multiple power levels so as to use only the pow er required to reach the network. In general, t he closer you are to a wireless base station antenna, the lower the power output level of the phone.Before a phone model is available for sale to the public, it must be tested and certified to prove to the FCC that it does not exceed the limit established by the U.S. government-adopted requirement for safe exposure. The tests are perform...