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Mimics the old rotary dial where the '1' was at the top and the 7-9 numbers at the bottom. Maybe - I dunno...
That's good enough for me.
I also found this -
A second theory refers to a study done by Bell Labs in 1960. This study involved testing several different telephone-keypad layouts to find out which was easiest to master. After testing several layouts, including one that used two rows with five numbers each and another that used a circular positioning, it was determined that the three-by-three matrix that had 1, 2 and 3 across the top was the easiest for people to use.
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Glorious ride to work this morning despite the roads being overcrowded with people who ride their bike like they have just removed their stabilisers and drivers who apparently think it's acceptable to suddenly u-turn in the middle of a busy road.