calculators The order of mathematical logic is the smallest to largest (0, 1, 2, 3, 4 ....), From the bottom up and reading from left to right .
phones keys were preceded by those of record. In the bottom of this order was identical to the keyboard current (7, 8, 9, o), in the middle were the numbers 4, 5, 6, (in the same positions they occupy in the calculator) and at the top, the numbers 3, 2, 1.
These could not be transported to the keyboard and the habit of reading left to right. In addition, carry the alphabet, so they ordered as 1, 2 (ABC), 3 (DEF), 4 (GHI), etc. ....
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