Nokia introduced this SMS alert tone on its early mobile phones, encoding the letters S-M-S in Morse code as short and long beeps. It became one of the most recognised phone sounds of the 2000s, heard in classrooms, offices and films whenever a text arrived. As smartphones replaced keypad phones, the tone survived as a meme staple, often remixed or dropped into edits alongside the Discord notification sound for fake message gags, because everyone still recognises that chirpy digital beep.