It was a surprise move from Apple when it moved from touch ID based smaller phones to all-screen devices. Users were fascinated two generations back when iPhone X released. Subsequently, the flagship from apple would further release bigger display smartphones. It was a big jump from 4.7-inches bezel display to 6-inches of the non-bezel screen. Those who switched to the larger display did found one small difficulty operating the device. Normally, all smartphone users use their right or left thumb to maneuver/perform action on the display. With a larger display some users found it a bit difficult to use one finger over a longer display unit. Hence, the solution came in the form of the Reachability Gesture feature.
If you enable Reachability, then on a larger display you can access the top end of the display easily with your thumb. You can simply drag down the display content to a comfortable position on the display, like from the top to the middle of the display. Here your thumb can easily reach the screen content and interact with it.
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