As a former telephone operator from this era who spent most shifts frantically bubbling scantrons as business men rattled off their calling card numbers and call numbers at lighting speed, I would have been delighted by this break in routine.
It was a paper record of every (paid) phone call. This was in the 80s before the switch to digital. The front side had the origin and destination numbers, the back side had the calling card number.
Also--we didn't use a 10-key! Our keypad was 2x5 rather than 3x3, and inverted (low numbers at the top).
