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One of the ways pundits and critics alike have highlighted is the ability to make the iPhone's outer bezel thinner by removing it altogether. Having an edge-to-edge display would cut down nearly an inch in width off the device, making it slimmer in the user's hand. The width of the screen likely won't change to retain backwards compatibility, but the shape of the smartphone can change around it.
(Image via CNET — Credit: MacRumors)