Samsung SGH-S390CSATFN - Manual (Page 20)

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15. Cancel/Clear key: Deletes characters from the display. In idle mode, press to
launch the calendar.
16. Power On/Off (END) key: Press to end a call. Press and hold for two seconds
to turn phone on or off. While in the Menu mode, returns phone to Idle mode,
then cancels input.
17. Right Soft key: Press to select the option displayed above the Right Soft Key.
18. Navigation/OK key: In menu mode, slide your finger across the navigation pad
to scroll through the menu options. Press to accept the highlighted option.
19. Earpiece: Use during calls to listen to callers.