TOKYO -- Online retailer Rakuten is set to make a splash in Japan's mobile phone market, which has long been dominated by three major carriers.
Online retailer's entry marks industry shift to 'ecosystems'

Rakuten has so far leased NTT Docomo's network infrastructure to provide its mobile phone service.
TOKYO -- Online retailer Rakuten is set to make a splash in Japan's mobile phone market, which has long been dominated by three major carriers.