According to the recently-posted report,
'Japan Handset Vendor Market Share by Operator in Q1 2017' report published under Handset Country Share Tracker (HCST) service,
Huawei, the world's no.3 handset vendor,
posted all-time-high share in Japan handset market during the quarter.
Huawei has been scaling up its marketing activities in Japan, one of the big volume handset market,
mostly focusing on SIM-free market and MVNO with its P, Mate and Nova series.
The in-detailed handset market share of Huawei and others
by operators in Japan can be viewed
at this HCST report.