Do one of the following:
Do one of the following:

You can choose a unique ringtone for calls from specific people so you'll know instantly who's calling.

Do one of the following:

You can modify the notification sound for all apps, or assign a distinctive sound to notifications from a specific app, replacing the default.
Do one of the following:

Tap the category for enabled notifications, then tap Sound and select a unique ringtone, or set it to none.
If an app's notifications are silent but you want to hear them:
If you're only getting some notifications from an app, check if Notification cooldown is on.


Tap 
Although your phone comes with lots of ringtones, you can get more:
If you're not hearing your ringtones:


