SIM Card

Using NTT DOCOMO’s vast mobile network, we deliver one of the most cost friendly SIM card services in Japan.


NTT Docomo’s Vast Cellular Network

Best area coverage among the main three carriers in Japan.

Affordable Plans

We provide plans at the most friendly prices on the market.

Easy Registration

Apply online presenting a photo ID and it will be ready for pickup/shipping.

Foreign Credit Cards Accepted

We accept both foreign and Japanese credit cards unlike other SIM providers.

No Annual Commitments

Our minimum contract period is 4 months (1st month free + 3 billing months).

Easy Contract Transfer

You can easily switch over to our service keeping your current phone number.


The plans below are available for all SIM card sizes (Nano, Micro and Standard). Our SIM cards are provided in 3in1 style which you can hallow out on the first use.

Activation Fee (One Time)
NTT Installation Fee (One Time)
3,000 JPY per SIM Card

#Prices shown above are excluding 10% consumption tax.

Monthly Fees (Recurring)

Basic Service

5 GB per month 10 GB per month 3 GB per 3 Days
Data Only (Recurring) 1,500 JPY 2,200 JPY 3,200 JPY
Data + SMS (Recurring) 1,700 JPY 2,400 JPY 3,400 JPY
Data + SMS + Voice (Recurring) 2,180 JPY 2,480 JPY 3,480 JPY

Discount Service

Multiple SIM Discount (Recurring)
-300 JPY per SIM Card

*Discount of 300 JPY applies to the monthly basic fee of the second (or more) Voice SIM application(s).

Optional Service

Call Waiting (Recurring)
300 JPY per SIM Card
Voice Mail
300 JPY per SIM Card

* Pay-per-use calling/SMS charges apply separately. See below for details. Any calls/SMS texts made during a billing cycle (billing cycle = 1st to the end of the month) are charged 5-6 weeks after. * Basic fee of first month (day of sign-up to end of month) is free. Billing commences on the 1st of the following month. * Minimum contract period is three full billing months (first month does not count as a billing month). Cancellations can be accepted after the 3rd month of contract. Cancellation must be requested online and the service will be terminated at the end of the billing cycle. * Switching between data plans (5GB or unmetered) can be done for no additional charge and the change takes effect on the 1st of the following month. *Switching between voice plans (Data-only or Data+SMS or Data+SMS/Voice) require the SIM card to be replaced, therefore is considered as a cancellation of the existing subscription and application under the new plan. Cancellation policies apply. * If the SIM card is damaged / lost or requires replacement for any other reason, a reissue fee of 3,000 JPY will incur.

#Prices shown above are excluding 10% consumption tax.

Calling Rates

Sample Rates

Domestic Calls Interenational Calls Billing Schedule
NTT Docomo Standard Rate 10 JPY per 30 seconds Not Callable 2 months after
Otoku Call Discounted Rate 10 JPY per 30 seconds See chart(click here) 2 months after

* Incoming calls/SMS are free. * SMS texts are 3JPY (domestic) or 100JPY (to international) per message. SMS are restricted to approximately 150 single-byte characters per message. * International Call = calling and overseas number from a location within NTT DOCOMO’s service area in Japan, using the prefix “0063” or the “Otoku Call” smartphone app. See table below. International calls are not taxed. * International SMS = sending an SMS to an international number from a location within NTT DOCOMO’s service area in Japan. * Service is intended for use in Japan only. International roaming is not provided.

#Prices shown above are excluding 10% consumption tax.

“3 GB per 3 Days” Plan

With unmetered data plans, the monthly data usage (DL/UL) is not accounted for. If your accumulated total data consumption within 3 days exceeds 3GB , your bandwidth will be throttled down to a maximum speed of 200kbpsuntil the 3-day total falls under 3GB.

*With the “5 GB per Month” plan, after exceeding the limit, theconnection speed will be throttled to under 200kbps for the rest ofthe month.


What is an eSIM?

An eSIM (embedded SIM) is a digital SIM card built into some smartphones. It can be programmed remotely to receive our plans. Before applying, a client must prepare a compatible smartphone and its EID, along with a credit card and piece of ID.

* An EID is a 32-digit number that can be found in the smartphone settings. We accept EIDs that start with 89049032, 89033023, 89033024, 89043051, 89043052

* Whenever the EID changes, the eSIM needs to be re-issued (fee = 1,500JPY) * If the downloading process of the eSIM plan is interrupted, or if the eSIM plan is deleted from the smartphone, the eSIM needs to be made re-downloadable on the system (fee = 1,500JPY) * After the eSIM plan is downloaded to the smartphone, you must install our APN profile to access the cellular data.


What is the service contract period?

The minimum service requirement period is activation month + 3 billing months. After this period, the service will switch to a monthly service and you will be able to cancel at the end of each month.

I’ve changed my phone and the SIM card is not working on the new device.

Whenever the SIM card is used with a new device, the APN profile would need to be installed on said device. Please refer to the APN Setup Guide in the Documents section to check how the profile can be installed.

Are international calling features available?

Yes, by adding the prefix “0063” in front of the number that you would like to call, you will be able to make International calls with the SIM card. An application called “Otoku Call” by Freebit can also be used to make the calls. Calls made through this app will automatically have the 0063 prefix added in front of the number. *Overseas use for our SIM card is disabled by default.

How do I cancel the service?

To cancel, please log into the SonixNet SIM Management Website and send us a cancellation request before the 25th to cancel your account at the end of the month. For example, cancellation requests will need to be sent in by May 25th, in order to cancel at the end of May.


APN Setup Guide (iOS)

APN Setup Guide (Android)

eSIM Setup Guide

Voicemail Service Instruction

International Calling Rates

Device Compatibility List


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,
Tokyo 106-0044
Tel: 03-3560-1006 Fax: 03-3560-1007