Samsung SM-G615F/DS User Manual page 69

Applications
Setting the message notification
You can change notification sound, display options, and more.
1
Launch the Messages app.
2
Tap Settings
3
Change the notification settings.
Notification sound: Change the notification sound.
Vibrate when sound plays: Set the device to vibrate when you receive messages.
Pop-up display: Set the device to display messages in pop-up windows.
Preview message: Set the device to display message content on the locked screen
and in pop-up windows.
Setting a message reminder
You can set an alert at an interval to let you know that you have unchecked notifications.
If this feature is not activated, launch the Settings app, tap Accessibility
reminder, and then tap the switch to activate it. Then, tap the Messages switch to activate it.
Notifications, and then tap the switch to activate it.
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Notification