Samsung SGH-T319NBBTMB - Manual (Page 22)

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Section 2
10. Deletes characters from the display.
In Menu mode, returns you to the previous menu level.
11. Ends a call. Also switches the phone on and off when
held down.
In Menu mode, cancels your input and returns the phone
to Idle mode.
12. In Menu mode, selects the highlighted menu options.
13. In Menu mode, scrolls through the menus and
Phonebook.
In Idle mode, the Down key allows you to access the
Phonebook Search menu directly.
When entering text, moves the cursor to the left or right,
depending on which side you push.
14. The earpiece is used to listen to audio from your phone.
15. The external display shows the received signal strength,
the phone battery level, the date and time.
16. The external speaker used for Speakerphone.
17. Used to take pictures when pressed. Launches the
camera with a press.