Why are numbers 1-9 on a mobile phone arranged with 1,2,3 on the top line, 4,5,6 on the line underneath, then 7,8,9 on the bottom line, but on a calculator it's the opposite: 1,2,3 on the botttom line, 4,5,6 on the middle, then 7,8,9 on the top. Who decided this?

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