Adjusting volume controls can help if you're not getting notifications/sounds/vibrating when receiving texts or emails.
Press the Volume buttons (on the right edge) up or down to adjust the:
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earpiece volume while on a call.
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media volume while listening to music or playing videos or games.
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ringtone volume when not on a call and no media apps are actively used.

To adjust volume settings when not on a call or actively using an app, do the following:
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From a Home screen, swipe up to access all apps.
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Navigate: Settings
> Sound.
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Adjust any of the following:
To adjust, touch and hold the green dot and drag left or right then release.
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Media volume
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Alarm volume
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Ring volume