Samsung SCH-A670ZSUXAR - Manual (Page 130)

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Section 10
Whisper Mode
This feature allows you to talk in a low volume during
a phone conversation and still be heard by the party.
1. In standby mode, press the Menu (left) soft key ( ),
then press (for Sounds) and for Whisper
Mode.
2. Use the navigation keys to highlight On or Off, then press
the key.