Billionaire Masayoshi Son, chairman and chief executive officer of SoftBank Corp., points to a journalist as he takes questions during a news conference in Tokyo, Japan, on Tuesday, Feb. 10, 2015. SoftBank, the wireless carrier controlled by Son, posted plunging third-quarter profit as Japanese subscriber growth stalled and losses widened at Sprint Corp. in the U.S. Photographer: Kiyoshi Ota/Bloomberg via Getty Images

Billionaire Masayoshi Son, chairman and chief executive officer of SoftBank Corp., points to a journalist as he takes questions during a news conference in Tokyo, Japan, on Tuesday, Feb. 10, 2015. SoftBank, the wireless carrier controlled by Son, posted plunging third-quarter profit as Japanese subscriber growth stalled and losses widened at Sprint Corp. in the U.S. Photographer: Kiyoshi Ota/Bloomberg via Getty Images