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As phone touch screen becomes larger and larger, for single hand holding posture, the user interaction can be extremely hard if icon do not be placed into proper touch area. So it is necessary to know the specific suitable touch zone on large phone screen. In this paper we performed a target selection task on a large screen smartphone and analyzed the task performance under different variable conditions. Response time, hit rate and hit offset differences between gender and target location and the possible reasons for such difference are discussed. Design recommendation for button and icon location are also been discussed based on the experiment result.

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