The whistle tone comes from Samsung Galaxy smartphones, where it was included as a built in notification sound simply called Whistle. As Galaxy phones sold worldwide through the 2010s, the melody became one of the most heard alerts in public, often mistaken for a real person whistling nearby. Clips of it spread to soundboards and video edits alongside other phone alerts like the Discord notification. Its short length, clear pitch and strong nostalgia for early smartphone years keep creators using it whenever a scene needs an unmistakable incoming message cue.