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Most of us are so used to accepting the common interfaces that we tend to overlook the calculator’s inverted key sequence. A calculator has the 7–8–9 buttons at the top whereas a phone uses the 1–2–3 format. https://www.doc.cc/articles/a-brief-history-of-the-numeric-keypad
@estherschindler I used to do accounts payable, so it was never lost on me that there is a difference. I can still use a calculator/adding machine without looking, but cannot do the same with the phone.