Speaker Button
Tap here to turn the speakerphone on or off. The light bar illuminates when it's on.
Mute Button
Tap here to mute the microphone during a call. The light bar illuminates when the microphone is muted.
Bluetooth Button
Tap here to switch between a Bluetooth device and the phone. The light bar illuminates to indicate that the call is using a Bluetooth device. The button is greyed out when there is no Bluetooth device available.