Silence
In the "Audio" menu, choose the "Ringer tone" entry with "OK".
Now select the "Silence" entry.
Select "Beep" or "Off" and confirm with "OK".
Advisory tones
You can choose whether a signal tone should sound for each of the following
functions ("Off"), or if you would like to hear a quiet or loud signal tone:
"Key tone": Signal tone "On" or "Off" for every pressed key.
"Acknowledgement tone": Signal tone "On" or "Off" when a setting is
confirmed.
"Battery empty": Signal tone "On" or "Off" when the rechargeable
battery is almost empty.
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