When iPhone released in 2007 with a big physical button build in it at the bottom of the iPhone. then the big question occurs from users of iPhones that why they have a physical back button it even the whole screen is fully touch screen and also has a back option on the touch screen. But at that time the only iPhone has the fingerprint scanner to provide the security to their users.


But on the demand of their user's apple engineers remove the back button and increase the screen size for more screen ratio. This feature or new design firstly come with iPhone X and it impresses everyone and it also secures mobile phones from water  resistance and provide more security from face detecting option of securing the iphone and their data.

This new bezel less design liked by everyone and the sale of the iphone also rank highly because of their new design and they were able to do it because of users understand smartphones well enough to use the bottom-swipe as an alternative to a mechanical button.