How can I listen to hear the ringtones on my Lumia 640 phone?
how can I listen to the ringtones installed to be able to pick one?
Go to settings->ringtones+sounds and then tap the field under ringtone.
Then you press the button that looks like a play button to listen to each ringtone listed
If you want to set one, just tap the name of the ringtone to do so.