Sony Ericsson was the joint venture behind a run of popular mid-2000s handsets, including the K750 and K750i launched in 2005 on the DB2010 platform. Their interface sounds were short, functional tones designed for tiny speakers, and the disconnect tone was heard every time a call ended. As those phones were replaced, users ripped the UI sounds for ringtones, edits and soundboards, where the clip survived as a retro alternative to a modern discord call tone. Its brevity and clarity keep it in use for hang-up jokes today.