Samsung GALAXY S III User Manual page 60

 Tap Speaker again to use the phone's earpiece. The green line will disappear when
Speaker is not activated.
Warning! Because of higher volume levels, do not place the phone near your ear during
speakerphone use.
●
Mute/Unmute: Turn the onboard microphone either on or off.

Tap Mute during a call to mute the microphone. A green line will appear under the
Mute button.

Tap Mute again to unmute the microphone. The green line will disappear when Mute
is not activated.
Note: If Mute is activated, the speaker mode is deactivated.
●
Headset: Connect to a Bluetooth headset.

Tap Headset during a call to activate a Bluetooth headset. A green line will appear
under the Headset button.

Tap Headset again to de-activate the Bluetooth headset. The green line will
disappear when the Headset is not activated.
●
Touch for more options:

Contacts: Go to your Contact list.

Message: Send a message during a call.

Memo: Write down a memo during a call.

Noise reduction On/Off: Turn on the Noise reduction feature when you are in a
noisy area. Turn it Off when not needed to conserve battery power.

My call sound: Configure the audio equalizer used during an active call. Choose
from Off, Soft sound, Clear sound, Optimized for left ear, or Optimized for right
ear.
Phone Calls 47