Samsung GALAXY S8 User Manual page 138

Speaker: Route the phone's audio through the
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speaker (On) or through the earpiece (Off).
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Activate Speaker to route the phone's audio
through the speaker. (You can adjust the speaker
volume using the Volume key.)
-
Deactivate Speaker to use the phone's earpiece.
Warning: Because of higher volume levels, do not place
the phone near your ear during speakerphone use.
Keypad/Hide: Toggle the appearance of the
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onscreen keypad. Show the keypad to enter
additional numbers, for example, an extension or
access code.
Mute: Mute the microphone during an active call.
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Tap again to unmute the microphone.
End: End the current call.
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Apps
Tap More options during a call to display a list of
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additional in-call features:
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Add to Contacts: Add the current caller to your
Contacts list.
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View contact: If the current caller is in your
Contacts list, this option displays the current
caller's contact information.
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Send message: Send a text or multimedia
message while remaining on the call.
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