Why it worked
The video leverages a popular and recognizable sound (iPhone ringtone) and remixes it into a trending genre (trap), creating an instantly engaging and shareable piece of content. The transition to a direct app promotion capitalizes on the viewer's interest generated by the audio.
Summary
The video displays an incoming call screen on an iPhone with a trap remix of the default iPhone ringtone playing. It then transitions to an advertisement for the "Marimba Remix Ringtones" app, encouraging viewers to download it from the App Store.