Have you ever noticed that the keypads for calculators and phones are different? Though both keypads have zero at the bottom, the remaining numbers go from bottom to top on the calculator, and top to bottom on the phone. Why is that? Read on to know.
When telecom companies developed phones, why didn’t they simply replicate the calculator keypad layout?
With these experiment results, Bell engineers were not confused anymore, and quickly implemented the design which people preferred, thereby resulting in the keypad layout which is still in use today and has been adapted to cellphones as well, but with a contrasting difference over calculator keypad layout.