LG LG840G - Manual (Page 26)

LG 840G | User Guide
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the second call by touching the Send Key
.
Rejecting an Incoming Call
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End Key
or touching .
Muting the Microphone
You can mute the microphone during a call by touching 5IF
handset can be unmuted by touching again. When the handset is
muted, the caller cannot hear you, but you can still hear the caller.
Using the Speakerphone
You can use the integrated Speakerphone during a call by touching .
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WARNING
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while the speakerphone is enabled.