Samsung Galaxy S5: How to Fix No Notification Sound when New Messages Arrive in Android 5.0.1 Lollipop

Your phone plays a sound(message tone) when receiving a new message to help you easily know that you have a new one. Thus, it could be a big problem if you don't get the sound when receiving messages since you may miss important ones. However, if you're facing no notification sound issue, these are some actions that can be taken to fix this issue:

#1: Make sure to not set "silent" as message tone
You can assign the required sound as message tone by by using the following steps:

1. Open the stock Messaging app.
2. Tap at the top right to open up the additional options.
3. Scroll down the options and then select Settings.
4. Scroll down the screen and then tap Notifications.
5. If Notifications is off, tap the ON/OFF switch to turn it on. The switch turns green when it's enabled.
6. Tap Notification sound.
7. Select the required sound (make sure to not choose "silent").
8. Tap OK button.
9. The selected sound has been set as message tone.

#2: Make sure to not set "silent" as the general notification sound
If you assign "Default notification sound" as message tone in the stock Messaging app settings or for a specific contact, it means that the general notification sound will be used as message tone. Thus, you have to make sure that silent is not set as the general notification sound by using the following steps:

1. On any screen, swipe down the top of the screen to open up the notifications panel and then tap at the top right to go to the settings menu.
2. With the settings menu is displayed in grid view, scroll down to the Sound and display section and then tap Sounds and notifications .
3. Scroll down to find Notification ringtone, and then tap it.
4. Select the required sound (make sure not to choose "silent").
5. Tap OK button.
6. The selected sound has been set as the general notification sound.

#3: Make sure your phone is not in vibration or silent mode
When your phone is in vibration or silent mode, the notification sound will be muted. Thus, you have to place your phone in sound mode to allow your phone plays a sound when receiving new messages by using the following steps:

1. On any screen, swipe down the top of the screen to open up the notifications panel and then tap at the top right to go to the settings menu.
2. With the settings menu is displayed in grid view, scroll down to the Sound and display section and then tap Sounds and notifications .
3. Tap Sound mode and then select Sound.
4. Your phone has been placed in the Sound mode.

#4: Make sure the notifications volume is not muted
You can adjust the notifications volume by using the following steps:

1. On any screen, swipe down the top of the screen to open up the notifications panel and then tap at the top right to go to the settings menu.
2. With the settings menu is displayed in grid view, scroll down to the Sound and display section and then tap Sounds and notifications .
3. If needed, you can drag the volume adjustment bar under Notifications to the right to increase the notifications sound volume.

#5: Make sure the notifications of the Messaging app is not disabled or blocked
You can enable notifications of the stock Messaging app to allow your phone plays a sound when receiving new messages by using the following steps:

1. On any screen, swipe down the top of the screen to open up the notifications panel and then tap at the top right to go to the settings menu.
2. With the settings menu is displayed in grid view, scroll down to the Applications section and then tap Application manager .
3. Swipe the screen from the right to the left to view the ALL tab. All installed apps will be displayed here.
4. Scroll down the screen to find Messages, and then tap it.
5. Check the box in the left side of the Show notifications option to enable it.
6. The notifications of the stock Messaging app has been enabled.

#6: If Do not disturb mode is enabled, make sure to set messages as exceptions
When Do not disturb mode is enabled, you have to set messages as exceptions to allow your phone plays a sound when receiving message by using the following steps:

1. On any screen, swipe down the top of the screen to open up the notifications panel and then tap at the top right to go to the settings menu.
2. With the settings menu is displayed in grid view, scroll down to the Sound and display section and then tap Sounds and notifications .
3. Scroll the screen to the very bottom.
4. Tap Do not disturb. 
5. Tap Allow exceptions.
6. If Allow exceptions is off, tap the ON/OFF switch to turn it on. The switch turns green when it's enabled.
7. Check the box next to Messages to enable this option.
8. If needed, you can choose whose messages will make your phone plays a sound by tapping Calls and/or messages from and then select from the following options:
• All: select this option to allow notification sound for all incoming messages.
• Favourite contacts only: select this option to allow notification sound for incoming messages come from those who are listed in your favourite list.
• Contacts only: select this option to allow notification sound for incoming messages come from those who are listed in your contacts list.