LG LGVS890 - Manual (Page 75)

73 Calls
When viewing the in-call screen, you can unmute the microphone by
tapping the Mute button again.
The microphone is unmuted automatically when the call ends.
To turn the speakerphone on or off
 Tap the Speaker button .
The light bar on the Speaker button illuminates blue up to indicate
that the speakerphone is on.
When viewing the Call screen, you can turn the speakerphone off by
tapping the Speaker button again.
The speaker is turned off automatically when the call ends.
WARNING!
To avoid damage to your hearing, do not hold the phone against your ear when the
speakerphone is turned on.
To switch between a Bluetooth headset and the phone
When a Bluetooth headset is paired and connected to your phone, you can
conduct calls on the headset for hands-free conversation. During a call, you
can opt to use the Bluetooth headset or just the phone.
When using the Bluetooth headset during a call, the Ongoing Call
notification icon is blue in the Status Bar (the icon is green when using the
phone).
 Tap the Bluetooth button to switch the call from the phone to the
Bluetooth device, or vice versa.