Sprint SPH - a780, User Manual

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Basics
58
Performance and Safety
Important Information About Your Phone and
Service
Keeping Tabs on Signal Strength
The quality of each call you make or receive depends on the signal
strength in your area. Your phone informs you of the current signal
strength by displaying a number of bars next to the signal strength
icon. The more bars displayed, the stronger the signal. If you’re inside
a building, being near a window may give you better reception.
Understanding the Power Save Feature
If your phone is unable to find a signal after 15 minutes of searching, a
Power Save feature is automatically activated. If your phone is active, it
periodically rechecks service availability, or you can check it yourself by
pressing any key. Anytime the Power Save feature is activated, a
message displays on the screen. When a signal is found, your phone
returns to standby mode.
Understanding How Your Phone Operates
Your phone is basically a radio transmitter and receiver. When it's
turned on, it receives and transmits radio frequency (RF) signals.
When you use your phone, the system handling your call controls the
power level. This power can range from 0.006 watts to 0.2 watts in
digital mode.
Knowing Radio Frequency Safety
The design of your phone complies with updated NCRP standards
described below. To further limit RF exposure, you can limit the
duration of your calls and operate your phone in the most power-
efficient manner. In 1991-92, 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 hybrid standard
consisting of the existing ANSI/IEEE standard and the guidelines
published by the National Council of Radiation Protections and
Measurements (NCRP).