Samsung Z400 manual In-Call Options,  KeyMute or KeyUnmute to mute the keypad, Speakerphone use

In-Call Options

Pressing Options (right softkey) during a call displays a list of available in-call features. To select an option, press the corresponding keypad number or select the option and press . The following options may be available through the Options menu:

KeyMute or KeyUnmute to mute the keypad.

TurnSpeakerOn or TurnSpeakerOff to route the phone’s audio through the speaker or through the earpiece.

Select TurnSpeakerOn to route the phone’s audio through the speaker. (You can adjust the speaker volume using the volume keys on the side of the phone.)

Select TurnSpeakerOffto use the phone’s earpiece.

WARNING	Because of higher volume levels, do not
	place the phone near your ear during
	speakerphone use.

WhisperModeOn/Off increases or reduces the built-in microphone's sensitivity.

Save to store the current number in your Contacts list.

ContactDetails to display Contacts entry details for a caller.

Contacts to display your Contacts list.

Messaging to access the messaging options.

3-WayCallto initiate a three-way call.

RecentHistory to display a list of recent call activity.

VoiceMemo to record the conversation of the other party on the line.

MissedAlerts to display missed calls.

Tools to quickly access your phone's tools, such as the calendar, calculator, or memo pad.

Settings to quickly access the Settings menu.

Press Mute (left softkey) during a call to mute the microphone. Press UnMute (left softkey) to unmute the microphone.

30 Section 2A. Phone Basics