Samsung SCH-N330PWMXAR - Manual (Page 26)

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Section 2
flashes and the phone sounds an alert, which indicates your
phone is about to shut down.
Alarm clock: The alarm clock is set.
Ringer off: Your phones call ringer is turned off.
GPS (United States only): Global Positioning Service
(GPS) for 911 is set to On for emergency calls only.
GPS (United States Only): Global Positioning Service
is set to On for location and 911 calls.
Silent mode : The ringer is silenced for all alerts,
incoming calls, and incoming messages. The phone
alerts you to these by vibration and a flashing service
LED.