Bell ringers were standard in rotary and early push button telephones through the mid twentieth century, driven by an electric motor striking twin gongs. By the 1960s that double ring had become the universal sound of a landline call in homes and offices, and it was widely imitated in film and television. As mobile phones replaced landlines, the recording survived online as a stock effect, shared on soundboards for retro edits, animations and prank videos where an old fashioned ring is instantly understood by any audience.