The sound comes from Grand Theft Auto IV, the 2008 open-world game from Rockstar Games, where it was used as the alert for incoming calls and messages on Niko Bellic's phone. As players shared clips and customised their own phones, the short beeping tone spread beyond the game and became a popular ringtone and notification sound for GTA fans. It remains in use in edits and streams today because it is instantly recognisable to players, much like the GTA V notification and other classic lines such as CJ from GTA SA, linking later games back to the series' mobile-phone era.