NTT docomo Optimus LTE L-01D Instruction Manual page 249

Be considerate of where you use your terminal and keep your voice and ringtone down
„Keep your voice down when using the terminal
in a quiet place such as a restaurant and hotel
lobby.
Please be considerate of the privacy of individuals around you when
shooting and sending photos using camera-equipped mobile phones.
The terminal is equipped with usual functions that allow you not to answer an incoming call or to mute
the sound.
„Silent mode → P108
Silent mode mutes the terminal's sounds, such as operation sounds and the ringtone.
* However, shutter sound is not available to set to mute.
„Vibrate → P108
Notifies incoming calls by vibration.
„Public mode (Power OFF) → P99
A message plays notifying callers that you are where you have to power off the phone and cannot answer,
and the phone automatically hangs up.
You can also use optional services such as the Voice Mail Service (P92) and the Call Forwarding
Service (P96).
Respect privacy
Functions for maintaining good manners in public places
„If you are in an outdoor public place, make sure
you do not disturb others.
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