Samsung SPH-N400 - Manual (Page 21)

Section 2: Understanding Your Phone
2A: Your PCS Phone - The Basics 20
Turning Your Phone ON and OFF
Turning Your Phone ON
To turn your phone on, press for a few seconds.
Once your phone is ON, it displays “Looking for Service” indicating that
your phone is searching for a signal. When you phone finds a signal, it
automatically enters Standby mode – the phone’s idle state. At this point,
you are ready to begin making and receiving calls.
If your phone is unable to find a signal after 15 minutes of searching, a
Power Save feature is automatically activated. When a signal is found,
your phone automatically returns to Standby mode.
In Power Save mode, your phone searches for a signal periodically
without your intervention. You can also initiate a search for
PCS Service by pressing any key (when your phone is turned ON).
Tip: The Power Save feature helps to conserve your battery power when
you are in an area where there is no signal.
Turning Your Phone OFF
Press for a few seconds until you see the powering down
animation on the display screen.
Your screen remains blank while your phone is off (unless the battery
is charging).