Sometimes the phone rings suddenly, but there is nothing in the notice.

If the phone rings for no reason, please refer to the following methods:

1. Please check whether the battery of the mobile phone is sufficient.

2. In standby mode, check whether there is a new notification in the notification bar on the screen.

3. If the mobile phone supports SMS repeat reminder function, please cancel the post-test: message-menu key-settings-(notification)-message repeat prompt tone-select "once" or "never". Please operate the recently launched model: Settings-Accessibility-Notification and Reminder-Select "Off".

4. Restart the phone.

5. If there is a prompt tone all the time, please back up the data (contacts, text messages, pictures, etc.). ) in your phone, and then restore the factory settings.

If the problem still exists, please take the purchase invoice, maintenance card and machine to the Samsung service center, and the professional after-sales engineer will help you test it.