The LG C3400 was an early 2000s LG flip phone, and its shutdown sound is one of the small system tones built into the handset. Sounds like this survived because people recorded and shared old phone audio online, turning familiar startup and shutdown chimes into short clips for soundboards and video edits. The C3400 tone is still used today mainly for nostalgia, helping creators instantly place a scene in the era of basic mobiles, physical keypads, and short, simple ringtones before smartphones became common.