Interesting question, eh?
Phones have 1-2-3 on the top row, whereas calculators have 7-8-9 on the top row. Why is it so? Why was this pattern preferred? Is there any psychological reason behind it? Read on to find out.
The holes in the phones were numbered 1-9 with 0 after 9.
... studies were conducted on how to arrange the numbers, so as to reduce the chances of error while dialing.
"People arrange numbers and letters in (the) order in which they normally read."
9^9 possible combinations.
...which said that people preferred a design that involved two rows of buttons horizontally placed. Apparently, those were the fastest and produced the least amount of dialing errors.
They installed button that had the order 7-8-9 on the top row. This pattern was inspired by desktop adding machines of the past.
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