Sony has announced a waterproof Android smartphone with a 6.4in screen (16.3cm). The firm is pitching the Xperia Z Ultra as being the slimmest large-screened handset on the market. It can also accept sketches or notes written using a standard pencil or metal-tipped pen in addition to an optional stylus. The firm says it intends for the device to challenge Samsung's dominance of the jumbo-sized handset sector. According to a study by consultants Transparency Market Research, Samsung accounted for 70% of the overall "superphone and phablet" market in 2012 thanks to the popularity of models including the Galaxy S3 and Galaxy Note 2....
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