Sanyo SCP-4000 - Manual (Page 21)

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When your phone has acquired service, the greeting banner will be
displayed along with the date and time when in digital mode.
The menu options will be displayed on the lower half of the
screen. This is known as the Standby display or Standby mode.
While in the Standby mode, press or of the Navigation key to
highlight the menu option you wish to select, or enter a phone
number using the keypad.
Power Save mode
Your Sprint PCS Phone comes with a Power Save feature that will
be activated automatically if your phone hasn’t been able to find
service after 15 minutes of searching. While this feature is active,
the phone’s battery charge is conserved. The phone will automatically
check for a service periodically. To manually prompt the phone to
check for a service, press any key. A “Power Save” message on the
display will let you know when the phone is operating in Power Save
mode.