Sanyo SCP-4000 - Manual (Page 82)

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Understanding how your phone operates
Your Sprint PCS Phone is basically a radio transmitter and
receiver. When it’s turned on, it receives and transmits radio
frequency (RF) signals. Your phone operates in the frequency
range of 1.9 GHz and 800 MHz. When your phone is in use, the
system handling your call controls the power level.
Radio frequency safety
In 1991–1992, the Institute of Electrical and Electronics Engineers
(IEEE) and the American National Standards Institute (ANSI)
joined in updating ANSI’s 1982 standard for safety levels with
respect to human exposure to RF signals. More than 120 scientists,
engineers and physicians from universities, government health
agencies and industries developed this updated standard after
reviewing the available body of research. In 1993, the Federal
Communications Commission (FCC) adopted this updated
standard in a regulation. In August 1996, the FCC adopted a hybrid
standard consisting of the existing ANSI/IEEE standard and the
guidelines published by the National Council of Radiation
Protection and Measurements (NCRP).
The design of this Sprint PCS Phone complies with these updated
standards. Of course, if you want to limit RF exposure even further
than the updated standard, you can choose to control the duration
of your calls and operate your phone in the most power-efficient
manner.