Mobile phone circumstances in Japan

2016 currently, the number of subscriptions for mobile phones in Japan, about 90% of the major mobile phone carriers, 10 percent have occupied MVNO called Kakuyasu SIM (cheap SIM).
Major mobile phone carrier, NTT DoCoMo, au, Softbank, they have sales offices in Japan either, and have almost same service.
As greatly difference from the mobile phone company overseas, they are selling in sets the terminal and the line, and you are not be able to use a third-party SIM card over the lock to the terminal.
Also, if you pay the terminal price in installment, devoted a discount of call charges on installment price, it is also said to feature're cheaper substantially terminal price.
For those reasons, many of the Japanese people tend to stay in the three carriers.

The past few years in such, companies provide a low-cost line called Kakuyasu SIM (cheap SIM) are being increased its share.
Kakuyasu SIM (cheap SIM) is a service that MVNO borrowed the leading line carriers such as DoCoMo has to offer, although the toll is in the pay-as-you-go, data communication fee is very cheap, for users who do not much use the call, very charming service.

Grouping of MVNO conpanies

Uniqueness

IIJ
OCN
BIGLOBE
So-net
mineo

Group of IIJ

IIJmio
DMMmobile
BIC SIM
BB.excite SIM LTE
hi-ho
Panasonic

Group of OCN

OCN mobile ONE
NTT plala
ASAHINET
FUSION(Rakuten mobile)
nifty(NifMo)
Tiki Tiki

Group of KDDI

UQ mobile

Group of DTI

U-mobile
TONE
freetel
PC depot
YAMADA
wireless gate