The sound is Apple's Marimba ringtone, introduced as the default ringtone on the original iPhone in 2007. Its simple marimba loop became so widely heard in public that it turned into a cultural cue for a ringing phone, long after later iPhones added new default tones. Clips of the ringtone spread through meme edits, prank videos and soundboards, where creators use it to trigger that instant head-turn reaction. It remains popular because almost anyone who has owned or heard an iPhone recognises the melody within the first few notes.