The company on Thursday unveils a new "humanoid" robot named Pepper that can not only communicate with the user, but also read his or her emotions.
The Internet is run by a cable monopoly in Comcast and a wireless duopoly in Verizon and AT&T, Son says. He wants to shake things up.
But Yahoo Japan will still use the eAccess network to kick-start its own mobile Internet services.
Yahoo Japan, partly owned by SoftBank and Yahoo, plans to use the acquisition to launch its own mobile Internet service.
Masayoshi Son, who'll be pitching US policymakers Tuesday to consider a stronger wireless industry to vie with broadband, might need T-Mobile to achieve his ultimate goals.
SoftBank CEO Masayoshi Son will reportedly argue that having a strong third mobile carrier will help even the playing field for in-home broadband.
The comment comes as rumors suggest his subsidiary Sprint is eyeing a possible T-Mobile buyout.
Supercell is a hot commodity in mobile gaming: its Clash of Clans and Hay Day have both hit the top in the Apple App Store's Top Grossing ranking for games.
Vivendi, which owns the world's largest music group, rejects the offer despite its $2 billion premium, the Financial Times reports.
The $21.6 billion deal was made complicated by a bidding war between SoftBank and Dish Network.