Why is there no sound in the "oppo r9s" message?

Processing method of mobile phone receiving silent information;

Check whether the phone has turned on the mute mode: Settings-Sound-Silent Mode-Turn on the complete mute function;

Check whether the phone is turned on in Do Not Disturb mode: Set-Do Not Disturb mode;

Whether the mobile phone has turned off the switch of the notification center: Settings-Notification Center-Information-Allow notification, displayed in the status bar, and displayed on the lock screen (at present, only ColorOS 2. 1 system has this function);

Whether to turn off information notification in mobile phone information settings: information-settings-information notification;

Check whether the phone has opened contacts. This session will not be reminded: contact-contact details-this session will not be reminded.

Short message (text or digital information directly sent or received by users through mobile phones or other telecommunication terminals) is a part of "unified communication" business planning.

The number of SMS characters that users can receive and send at a time is 160 English, numeric or 70 Chinese characters.

Short message is a kind of telecommunication service accompanying digital mobile communication system. It passes through the signaling channel and signaling network of the mobile communication system.

The transmission of text or digital short messages belongs to non-real-time and non-voice data communication services.