My mobile phone always rings or vibrates inexplicably, and there is no notice or information when it is turned on. What happened?

If the mobile phone always vibrates inexplicably, I suggest you:

1. Check whether the information reminder function is on, and set-auxiliary function-notification reminder-vibration-off.

2. Check whether it is the notification function of third-party software, such as QQ and WeChat, and there are unread notifications/messages.

3. Back up data (contacts, text messages, photos, etc. ) and try to restore the factory settings.

4. If the problem still exists, it is suggested that you take the machine, purchase invoice and maintenance card to the local Samsung after-sales service center for testing.