When someone calls you* the app looks up the caller's name in your contacts and morses the callers name using the volume of your ringer.
This therefore *augments* the ringer sound. Ste the ringer to silent if you want only the morse code.
By this you will be clearly identified as a cool person (know morse code) and everyone who hears your phone ring will want to be friends with you.
Rings your callers name in morse.