Is cell phone ringing good for serious meetings?

Cell phone ringtones are not good for serious meetings.

When using mobile phones in serious occasions such as meetings and ceremonies, you should try to use the SMS mute function and turn on the prompt vibration. When replying to the message voice, try to reduce the volume.

This is because I am worried that it will affect the normal conduct of the meeting. Not only reporters should be turned off or muted, but all the people attending the meeting should also be turned off and muted. However, people attending formal meetings can't answer the phone and must turn off their mobile phones to keep quiet.