If you have a calculator and cell phone handy, take a look at them carefully and compare their button layout. You’ll quickly notice that the phone keypad begins with the digits 1, 2, 3… whereas the calculator starts with the digits 7, 8, 9… Why are they in reverse order?
There are several theories about this subject. It’s mainly designed in this way to provide users with more convenience and the ability to speed dial or choose digits quickly. Let’s rewind to the past and see how it was before.
At the beginning of 1900, this telephone was invented. Using the rotary dial, one could select a given phone number.
In the 60s it was replaced by a mini keypad, which proved to be much more comfortable
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