Samsung SCH-R400ZPAMTR - Manual (Page 14)

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8. CLR Key — Deletes characters from the display when you are in text entry
mode. Press this key to return to the previous menu or screen when
navigating features on your phone.
9. END Key — Ends a call. If you press and hold the END key, the power goes
On or Off. When you receive an incoming call, press to send the call to
voicemail.
10. Right Soft Key — Used to navigate through menus and applications and
to select the choice indicated at the bottom right corner of the Main
Display.
11. OK Key — Pressing when navigating through a menu accepts the
highlighted choice in a menu.
12. Speakerphone Key — Lets you enable/disable speakerphone mode.