• OK
    Start use on the day
  • 1GB/30days 2GB/3months
    Selectable Package
  • Rechargeable


Service Overview

Welcome to Japan! This prepaid SIM card can be used throughout Japan.

As of August 9, 2022

  1GB/30days 2GB/3months
Service period: 30days 3months
Data capacity of 1GB 2GB
brastel card

The Brastel Card allows you to place calls by using its dedicated app.
* You can apply for a number starting with 050 and receive incoming calls from the other party. Please refer to the following URL for details. http://brastel.com/japantravelsim
> Notice about Brastel Card International Call Service Payment Slip.

* It will be charged from September 1, 2022.
> Click here for details.

Sales price: Set by the retailer
Wide coverage: Service available anywhere in Japan.
Transmission rate: 4G(LTE)
(Maximum 788 Mbps downlink/50 Mbps uplink)
  • * Transmission rate depends on your device. 
    * 3G network is available outside of LTE coverage.
  • The package design is inspired by Mt. Fuji, cranes, and other Japanese elements.
  • Not only the SIM card, it also comes with origami paper and instructions on how to make an origami crane, offering a hospitality set.
  • What's more, the back of the board is a folding screen, which makes for a decoration and souvenir for a friend.

Step for Use


Insert the SIM card
into your device.


Perform all necessary adjustments and configurations before using the SIM card.


Start to use service.

1GBWith this SIM card, you can access/use

News site top page
(mobile site)

Approx. 3,410 times

(text message of 600 words in English)

About 204,800 messages

Map app*

Approx. 280 times

(3-minute calls)

Approx. 580 times (1,470 min.)
  • * Display a map on the Android "Google Map*2" app and zoom out and in 5 times.
  • * This figure is an estimate when using the app on a smartphone.
  • *2 : Displaying map images, with no cached data, of different locations by zooming out and in.

Customer support

  • IIJ Support Center is available year-round
  • 9:00 - 19:00 / TEL: 03-5205-4999

*Customer support is available in Japanese, English, and Chinese only.

Service and Communication Specifications

  • The period of Service availability varies depending on your package. Service period cannot be extended.
  • Your first use of the service should be prior to the end of the service start expiration date printed on the package.
  • You can purchase the "IIJmio Coupon Card" to add data volume to your package within the period of Service availability.
    *Even if the "IIJmio Coupon Card" is used to add data volume to your package, the period of Service availability cannot be extended.
  • Network coverage is described on NTT DOCOMO's Web site (Japanese only).
  • A private IP address is assigned to this package. However, this does not guarantee that all applications and services are operable.
  • The transmission speed provided here is the maximum value defined by the technical standard and does not indicate the actual transmission speed.
  • This service is available with best-effort delivery, and therefore the actual transmission speed may vary according to traffic conditions and network load.
  • Disconnection may occur when a connection remains established past the specified period of time or when a period of no data transmission continues.
  • This service uses radio waves. Even within a coverage area, the service may not be available indoors or depending on surrounding obstacles (buildings, terrain, etc.). In certain cases, this service may not be available on the upper floors of high-rise buildings even without obstacles.
  • The initial PIN code is set to "0000." For an explanation of how to set the PIN code, please refer to your device's user manual.

Handling the SIM card

  • When handling the SIM card, do not apply more load than necessary. Incorrect handling of the SIM card may damage the card and/or your device.
  • Do not touch the metal terminal part and always keep them clean for use.
  • If you touched the metal terminal part, wipe it with a dry, soft cloth before use.
  • When storing the SIM card, do not place it in locations where it can be exposed to direct sunlight and/or high temperatures/humidity.
  • Take notes or use other means to retain the information that you registered in the SIM card. Internet Initiative Japan is not responsible for any loss of such registered information.

Safety Precautions

  • Before removing the SIM card, wear gloves and always turn off the power.
  • A parent or guardian should supervise the handling of the SIM card if a child is the user. Make sure that the child user is using the SIM card as instructed.
  • Do not place the SIM card in a microwave or other cookware or high-pressure containers.
  • Do not use or leave the SIM card near fire or a stove, or other places where it can be exposed to high temperatures. The SIM card may melt, generate heat and/or smoke, catch fire, malfunction, or lose data.
  • Keep out of reach of infants. Accidental swallowing and injuries may occur.