What if Samsung mobile phone receives the message without prompting?

If there is no message prompt tone when receiving SMS, suggestions: 1. Try to reset SMS: message-menu key-settings-notification check, and select ringtone. 2. Check whether the phone is turned on in silent mode, and pull down the top curtain to turn the sound green. 3. SMS-Menu button-Settings-Notification-Check. 4. Set the notification volume of the mobile phone (Settings-Sound-Volume-Notification, turn up the notification volume). 5. Try to replace other built-in system ringtones. 6. Please back up the data (contacts, text messages, pictures, etc. ), and then restore the factory settings (Settings-Reset/Privacy/Personal-Restore Factory Settings). If the problem still exists, please take the purchase invoice, maintenance card and machine to the service center, and the professional after-sales engineer will help you test it.