Samsung SCH-A645BKAATL - Manual (Page 204)

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Section 14
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.
Maintaining Your Phone's Peak Performance
For the best care of your phone, only authorized
personnel should service your phone and accessories.
Faulty service may void the warranty.
There are several simple guidelines to operating your
phone properly and maintaining safe, satisfactory
service.