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SoftBank Corp. Aquos Crystal2 smartphones, manufactured by Sharp Corp., sit on display during a product launch in Tokyo, Japan, on Tuesday, May 19, 2015. SoftBank's Japanese mobile business added a net 1.8 million subscribers in the year ended March bringing the total to 37.77 million, the company reported last week. Photographer: Kiyoshi Ota/Bloomberg via Getty Images

SoftBank Corp. Aquos Crystal2 smartphones, manufactured by Sharp Corp., sit on display during a product launch in Tokyo, Japan, on Tuesday, May 19, 2015. SoftBank's Japanese mobile business added a net 1.8 million subscribers in the year ended March bringing the total to 37.77 million, the company reported last week. Photographer: Kiyoshi Ota/Bloomberg via Getty Images