Before you start: It is impossible to customise the notification sound for 3rd party applications unless the app developer build that functionality in.

  1. Go to the Settings app on your iPhone. 
  2. Tap Sounds & Haptics.
  3. Under Sounds and Vibration Patterns, select the type of notification you want to change the sound for.

4. A list of various default sounds is at your disposal. Tap on the sound to listen to it.

Tip: If you have uploaded any ringtones, they will be displayed at the top of the list.

 

  1. Once you select a new notification sound, a checkmark in front of the sound's name will mark your selection.

To change the sound for any other notification, repeat the steps above. 

It was easy, right? :)