Lexus GS 350 Owner's Manual page 509

5-4. Using the hands-free phone system (for cellular phone)
Speaking on the phone
The following screen is displayed when speaking on the phone.
To adjust the incoming call volume
■
Select "-" or "+", turn the "PWR/VOL" knob, or use the volume switch
on the steering wheel.
To prevent the other party from hearing your voice
■
Select "Mute".
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