Phone keys run 1-2-3 from the top
A phone keypad starts with 1 at the top. A calculator starts with 7 at the top. Same ten digits, opposite order.
Category: Keys & screens
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Feature. It was tested, and it won.
The telephone layout came out of 1950s human factors research by Richard Deininger and others at Bell Labs under John Karlin. At the time few people used calculators, so the layout was chosen on dialling speed and accuracy alone.
Source: Telephone keypad, Wikipedia.