We are an MVNO service operating on NTT Docomo’s vast cellular network. All of our SIM cards are compatible with unlocked or SIM-free phones. We offer a total of 6 different plans and you can choose whether you want 5GB per month or an Unmetered Data plan. Click here for more information on what an Unmetered SIM plan is.
Unmetered Plans – Bring your own device
*Get up to 30GB per month. Comes with a local Japanese phone number.All calls/SMS are pay-per-use
*Get up to 30GB per month. Voice calls are not available with this plan. All SMS are pay-per-use
Unmetered Data Only
*Get up to 30GB per month. This plan does not come with a local Japanese number. Voice calls/SMS are not available with this plan.
5GB Plans – Bring your own device
*Get 5GB per month. Comes with a local Japanese phone number. All calls/SMS are pay-per-use
*Get 5GB per month. Voice calls are not available with this plan. All SMS are pay-per-use
5GB Data Only
*Get 5GB per month. This plan does not come with a local Japanese number. Voice calls/SMS are not available with this plan.
We require you to keep the service for a minimal of the first free month + three billing months (billing is on the 1st of each month). After the first three months are fulfilled, you are free to leave the service at any time.
Request your cancellation online by the 25th of your cancellation month and the service will be terminated at the end of the billing cycle (billing cycle = 1st to the end of the month)
Upon sign-up, please prepare your own smartphone/tablet or mobile hotspot device that is SIM-free, and compatible with NTT Docomo’s cellular frequencies (4G/LTE, 3G/GSM).
Incompatible devices may not function properly. For a list of tested devices that are available domestically, please click here. Assist Solutions will not be responsible for any issues caused due to incompatibility.
Request to switch between data plans (5GB or Unmetered) can be accepted for no additional cost at any time and the change takes effect from the next billing cycle.
Changing the SIM functionality (Data-only or Data+SMS or Data+SMS/Voice) requires the SIM card to be replaced, therefore is considered as a cancellation of the existing subscription and application of a new plan. Cancellation policies to the cancelling subscription apply.
By Online Form (Anytime)
By Chat (Anytime)
Click bottom right “Chat Button” ↘️
By Phone (9:30-18:00 JST)
Toll Free within Japan
From Overseas (Incur Overseas Calling Rates)
By Team Viewer (Support)
Subway Oedo Line / Nanboku Line
Short distance walk from exit 6
of Azabu-Juban Station
(1F of our building is Domino’s Pizza)
3F Azabu Maruka Bldg.,
3-8-2 Higashi Azabu, Minato-ku,
Tel: 03-3560-1006 Fax: 03-3560-1007