A number of different patterns were considered for the key arrangement of the telephone

ByRob Brewer

The placement of the numeric keys from "1" to "0" on the phone is the same for both fixed and smart phones, but in the first place it should be placed in a circle following the dialing formula, Whether to arrange it, various ideas were issued.

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Telephone Keypad Design
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Early phones did not have dials or numeric keys in the first place, and the main body and the transmitter were united. Very early telephone subscribers prepared two main bodies and operated as a pair, but eventually telephone exchange became the mainstream, soon it became possible to connect to the other party via the exchange.

ByFrédéric BISSON

Numbers from "1" to "0" are arranged in the counterclockwise direction on the front of the main body of the dial type telephone.

ByMpotify

In the meantime, the push-button type phone that began to be used in place of the dial type. Numbers from 1 to 9 were arranged in 3 rows × 3 rows from the top left, 0 was placed under 8.

ByHades 2k

This arrangement is used as it is not only for fixed phones and public phones installed in homes and stores, but also for mobile phones and smart phones.

ByJonas Forth

Arrangement is different from calculator which also requires ten numeric keys. However, in fact at the stage of reviewing the key placement, the place similar to the calculator was also listed as a candidate.

By401 (K) 2012

In 1960 AT & T was investigating how to arrange the key. Its designDataGeneticsIt is easy to see the image.

Those which follow the arrangement of numbers on a conventional dial type telephone as it is


Transferred placement by dial type to line symmetry


Those numbers arranged in a circle


This is also a similar arrangement, but centered on "0".


Same position as the face of the clock


Like the speedometer, the lower left is 1, draw a circle there and the lower right is 0.


Arranged in an arch shape using only the upper half of the circle


Since it is not a dial type, it is not necessary to be a circle, and a cross shape arrangement is also available.


Arrangement of 5 rows × 2 columns


The fact that five keys are arranged in two rows is the same, not from the side but from the lower left to the upper right.


Arrangement of 2 × 5 columns


Placement of 3-4-3


Arrangement like reverse pyramid of 4-3-2-1


Placement of 4-4-2


There is 0 below, the same arrangement as a calculator that numbers grow from bottom left to top right.


And the current arrangement where the numbers grow from the top left to the bottom right, and 0 is placed below 8.


It is said that the current placement was decided after repeated consideration, such as which arrangement in which arrangement can be pushed quickly, whether pushing is small or not.