Why phones are made vertically?

Computers,laptops,Theaters and everything which can display something to us is in landscape but why mobile phones are made vertically.Everything behind the design,is having some science.There is no science,that is not succeed.In the beginning of the telephone invention,people want to speak and hear.So the telephone is made vertically and approximately ear and mouth height.Then lesser the length,when mobile was invented.Not only the reason hear and speak,cell phones are want to take outside so the design wants a small size and also put in our pockets.So that cell phones and smart phones are made vertically.Another reason for vertical screen is,people are set by something they never change.Telephones are in vertical then designer does vertical cellphones,now smartphones are made vertically.You see great example of this theater and computer are still made in landscape.Three reasons Tradition,People set by their view and science.As per human eye sight view landscape video will easily visible and recognized.Vertical videos in big screens are not easily visible and recognized by human eyes.But mobile phones are small in screen size so that easily visible.

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