- Ever wondered why many landline phones and even some cellphones (with physical numpads) have a small bump on or around the key #5?
Answer – It’s primarily to help visually impaired persons find the center of the keypad and work their way around it.
That bump can also be found on several other electronic devices like calculators and remote controls which isn’t specifically for visual impaired people but for people to navigate the buttons in dark situations. The same goes for the phones as well.
Same reason for physical keyboard as shown in figure below.
Hope we increased your knowledge:)