Sanyo SCP-4000 - Manual (Page 81)

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Usage guidelines:
All about performance
and safety
Keeping tabs on signal strength
The voice quality of your Sprint PCS Phone TM will always be at its
best when the antenna is fully raised. If you’re inside a building,
reception may be better near a window.
The quality of each call you make or receive depends on the signal
strength in your area. Your phone will inform you of the current
strength by displaying a number of bars next to the signal strength
icon. The more bars displayed, the stronger the signal. (See page 7
for an illustration of the signal strength indicators.)
Understanding Power Save mode
If you’re trying to use your phone in an area where the signal
cannot be found, the Power Save feature will automatically
activate to conserve battery power when you’ve been unable to
pick up a signal for 15 minutes. If your phone is on, it will
periodically recheck service availability, or you can do so yourself
manually by pressing any key. A message will be displayed on the
screen any time Power Save has been activated.