Japanese Prepaid data SIM
This is the SIM to have if you are heading to Japan! You can't buy SIMs on the ground in Japan, and you save a big hassle by dealing in English with all the settings etc., sorted before you leave home. dataGO is the only company outside of Japan selling prepaid Japanese data SIMs.
Pre-loaded, pre-activated, ready to run, reliable and fast data.
Data only, and must have a 800 or 2100 compatible device (see below).
Summary: Prepaid Data SIM for Japan
We only stock factory made Mini-SIM (Normal Size), Micro-SIM, or Nano SIMs.
NTT DoCoMo FOMA network
DoCoMo has one of the largest and fastest networks in Japan.
For specific coverage you can check here (the links on that page are in Japanese).
This SIM is very popular with skiers, and there is a page here, with some extra information on coverage at four of Japan's popular ski resorts/areas; Niseko, Rusutsu, Kiroro and Hakkoda (all of which show good coverage).
If you use all the 1GB top-ups can now be purchased here.
Data Transmission Speed
SIM-free (unlocked) device
W-CDMA / HSDPA / HSUPA: 2100 MHz or 800 MHz
Please check your device compatibility for 2100 or 800 MHz here at GSM arena
Please also check your device compatibility here
There is a bunch of FAQs and the activation guide here
Precaution Statement for Prepaid Data SIM Card Purchase
Please read and understand the followings before purchasing.