
Microsoft Lumia 640
Find "Messaging"
Slide your finger down the display starting from the top edge of your phone.
Press ALL SETTINGS.
Press ALL SETTINGS.
Press notifications+actions.
Press Messaging.
Select message tone
Press the field below "Notification sound".
Press the play icon next to the required message tones to listen to them.
Once you've found a message tone you like, press the required message tone.
Return to the home screen
Press the home icon to return to the home screen.