I'm currently making a video, which will include all the references I was able to understand, but the dialpad isn't how the original SCP worked. It was based on 3 things in the story: The amount put in (more the 500 yen is bad), the amount of times used (more then 10 times in a day is bad), and whether it's powered or unpowered (unpowered is bad). With that being said, the developer could do a ton with that alone.