We did have to be somewhat mindful when reading an e-book, for example, as any accidental encroachment of the thumb onto the edge of the screen can trigger a page flip.

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Edge magic: thumb gestures from all four edges of the screen enable users to find content and switch between apps faster than other phones.

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An impromptu group gallop along the edge of a field led to a fall, and when I stood up my thumb didn't.

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