The mobile phone rings a prompt tone, and there is no news.

There are basically the following reasons: 1. Some notification information. You can go to the notification bar and status bar in the settings, check the notification management, find the software that sends notifications, and turn it off by "ringing or allowing notifications". Some softwares have automatic reminders. Sometimes when the network is disconnected and then resumed, some software will make a sound. Some software will keep making sounds, but you can't see the push and information. Sometimes this happens after the system is upgraded. 6 may be an unread message reminder. 7 may be a reminder of the power of the mobile phone. When some short messages are intercepted, they will also make a sound. You may accidentally touch the tone button, so you can open the settings, enter the auxiliary function to check the tone type, and close the unnecessary ones. Can be set, including online prompt tone and minute prompt tone (can be set to prompt once every minute).