Stories like this keep the myth surrounding Kraftwerk alive:
Kraftwerk’s legendary Kling Klang studio was famous for containing many weird and wonderful electronic instruments, but one of the strangest was also one of the most mundane: the telephone. In order to avoid any irritating disturbances when the band were at work, it didn’t have a ringer. Occasionally, the story goes, a journalist with the rare opportunity of interviewing the band over the phone would be given a precise time to call, and at that moment one of the band, usually co-founder Ralf Hütter, would pick up the receiver. If there was no one there, he put it down again. That was it. You’d missed your chance. You could try calling as many times as you’d like, but no one would hear you.