The steps below will fix the following problems:
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Text message comes in but notification doesn't sound off
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Apps no longer notifies user of updates, etc.
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Notification sound not playing even with volume turned all the way up
- Phone shows it's ringing but ringtone doesn't play (look for Phone or Dialer app)
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From the Home screen, tap the Apps icon.
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Find and tap Settings to open it.
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Touch Sounds and notifications.
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Under the Notifications section, tap App notifications.
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Scroll to and tap on Messages (or any app).
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Now feel free to Block / Unblock notifications for the app.