Google 4 Manual Book page 66

USE THE PHONE APP
Controls the audio output as
follows:
• If a Bluetooth headset is not
connected: Turns the speaker­
phone on or off.
• If a Bluetooth headset is con­
nected: Functions as a 3­way
switch between the built­in
earpiece, the speakerphone,
and the headset. The icon
changes to indicate the cur­
rent output. Touch & hold to
see a 3­way menu.
• If a wired headset is plugged
into the phone, it replaces the
phone's built­in earpiece.
Mute your microphone.
Put the other party on hold.
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