What is the best voice SIM for foreigners in Japan? GTN Mobile

Communications support for a safe life in Japan

There are many situations in life in Japan where reliable communication via phone or message is required, such as making hospital appointments, contacting work, dealing with government offices or real estate companies, etc. Having a communications environment that allows you to safely carry out such everyday interactions is essential for living smoothly in Japan.

To support your life in Japan, GTN Mobile offers voice SIM plans that utilize the networks of Japan's major carriers. While providing stable communication quality to comfortably support your daily communications and internet use, the plan also offers the option to add lifestyle support and insurance services as options to supplement your communications as needed.

Communication barriers that foreigners living in Japan often face

In Japan, phone number and SMS authentication are required in many situations, such as opening a bank account, applying for a part-time job, making a hospital appointment, and signing a rental contract.
moreover,
Many people have concerns such as: ・I am worried about completing procedures in Japanese ・I don't have a credit card or bank account so it is difficult to sign a contract ・I want to prepare a means of communication before coming to Japan
GTN Mobile has been providing services that address the unique challenges faced by foreigners.

A track record of supporting foreigners living in Japan

Since launching its service in 2015, GTN Mobile has been supporting the communications environment for foreigners living in Japan.
・Supported languages: 13 languages*
・Total number of users: Over 130,000 ・SIM pick-up locations: 12 locations both in Japan and overseas With multilingual support and many years of experience, we have put in place a system that allows you to start your life in Japan with peace of mind.

*Supported languages: Japanese, English, Chinese, Korean, Indonesian, Vietnamese, Nepali, Mongolian, Tagalog, Burmese, Cantonese, Hindi, Portuguese
*Official website languages: Japanese, English, Chinese, Korean, Indonesian, Vietnamese, Nepali, Mongolian (as of February 2026)

You can prepare before you come to Japan, no credit card or Japanese bank account required!

GTN Mobile allows you to apply online before coming to Japan, so you can secure a phone number before you arrive in Japan.
Even if you don't have a credit card or a Japanese bank account, you can pay in cash at convenience stores nationwide .
Even those who have just arrived in Japan or are unsure about payment methods can sign a contract with peace of mind.

Also,
- Another feature is the flexible and easy-to-understand contract terms, such as no contract period restrictions and no cancellation fees.
Even if you have not yet come to Japan, you can easily apply with your passport, COE*, and ID card from your home country .
Reservations can be made up to 14 days before your planned arrival date , allowing you to secure a mobile phone number before you arrive and start using your smartphone as soon as you arrive in Japan.

*COE: Certificate of Eligibility

SIM card pickup available at airports, both domestically and overseas

You can also receive a SIM card at the airport when you enter Japan, allowing you to use the Japanese communication environment from the day you step off the plane.

Airports where pickup is available:
・Haneda Airport ・Narita International Airport ・Centrair International Airport ・Kansai International Airport

You can also pick up your SIM card at a GTN store overseas before coming to Japan.
・Vietnam : Hanoi/Ho Chi Minh City
・Korea : Seoul)
・Mongolia : Ulaanbaatar
You can prepare your communication means before coming to Japan, so you can start your life in Japan with peace of mind as soon as you arrive.

Furthermore, you can apply for a SIM card at a GTN store even after entering Japan.*
・Tokyo: Shin-Okubo
・Osaka: Honmachi, Chuo Ward, Osaka City

*If you apply in person or by mail (within Japan), you will need to register your address on your residence card.

GTN Mobile Direct Store & SIM Pickup Location

A communication plan that supports your life in Japan with peace of mind thanks to major carrier lines

GTN Mobile offers plans with voice calls using the networks of major Japanese carriers.
You can choose the plan that best suits your usage style and living environment.
We ensure stable communication quality throughout Japan, and you can make calls and send SMS smoothly.

GTN 5G Unlimited (Rakuten network)

This plan is recommended for those who want to use data without worrying about data capacity.

・Unlimited domestic high-speed data ・5G compatible for smooth communication ・Up to 2GB free per month in over 70 countries and regions overseas ・Ideal for those who frequently watch videos and make online calls

Data capacity	Monthly fee*1
Unlimited*2	4,048 yen

*1 Calls and SMS are charged on a pay-as-you-go basis.
*2 Speeds may be reduced due to fair service provision or environmental factors.

GTN 5G Unlimited

GTN Mobile Eazy (Docomo line)

This plan is recommended for those who want flexibility in choosing the plan based on their usage.

・Choose from 3GB, 10GB, 30GB, or 50GB ・Data volume can be carried over to the next month ・Available as an option for unlimited domestic 10-minute calls ・Ideal for those who prioritize cost and ease of use

Data capacity	Monthly fee*1
3GB	1,200 yen
10GB	2,200 yen
30GB	4,200 yen
50GB	6,200 yen

*1 Calls and SMS are charged on a pay-as-you-go basis.

GTN Mobile Eazy

GTN 5G Blaze (SoftBank line)

This plan is recommended for those who prioritize communication quality.

・Stable 5G connection from a major carrier ・Easy to watch videos and hold online meetings ・Choose from 5GB, 15GB, or 25GB

Data capacity	Monthly fee*1
5GB	1,480 yen
15GB	2,880 yen
25GB	4,480 yen

*1 Calls and SMS are charged on a pay-as-you-go basis.

GTN 5G Blaze

GTN Care (SoftBank line, GTN's original plan for starting your life in Japan with peace of mind)

This is a support plan that not only supports communications but also life in Japan itself.
In addition to voice calls and high-speed communication, it also includes life support interpretation services and compensation services.

GTN Assistant, a daily life support interpretation service
This support allows even those who are unsure about their Japanese language skills to live with peace of mind.
・Supports 25 languages ​​(medical interpretation available)
・First month free・Available 24 hours a day, 365 days a year*
・Life consultations available via chat and phone ・Disaster and lifestyle information also provided
*Chat hours: 10:00-21:00 (excluding New Year's holidays)

Convenient compensation service
We have concluded accident insurance with insurance companies for customers who subscribe to GTN Care, so you will automatically be covered.
・Injury and hospitalization compensation ・Daily life liability compensation ・Injury and death compensation Living in an unfamiliar culture or place can mean encountering unexpected difficulties.
If you are a GTN Care subscriber, you can receive compensation to cover the risk in such a situation.
GTN will support you with any troubles you may have in your daily life in Japan.

Data capacity	Monthly fee*1
10GB	3,980 yen
20GB	4,980 yen

*1 Calls and SMS are charged on a pay-as-you-go basis.

GTN Care

GTN Assistant (Life Support Interpretation Service)

GTN Assistant is available as part of the GTN Care plan, and can also be added as an optional service for those using other GTN Mobile voice SIM plans. The first month is free. Even if you are not confident in your Japanese language skills, you can receive interpretation support in everyday life and medical situations, allowing you to continue living in Japan with peace of mind.

GTN Assistant also supports the medical interpretation service "MEDI PHONE." We have a system in place that specializes in interpretation in medical settings, and have handled over 100,000 cases to date. We have also provided services to the Japan Medical Association, the Ministry of Health, Labor and Welfare, and local governments, so it is an interpretation service you can use with confidence.

GTN Assistant

You can also get a Japanese credit card along with your SIM card.

When you start living in Japan, there are many situations where you will need a credit card, such as for online payments and everyday shopping.
However, many foreigners find it difficult to get a card because they do not have a Japanese bank account.
In such cases, a convenient option is a credit card for foreigners that can be applied for at the same time as signing up for a SIM card with GTN Mobile.
This is a convenient service that allows you to prepare your communications and payments all in one place, so you can start your life in Japan with peace of mind.

Main features of the credit card : ・No registration fee or annual fee, ・Card exclusively for foreigners, ・Can be applied for even if you do not have a Japanese bank account, ・Can be used for online payments and everyday payments, ・220 yen discount per month when paying SIM fees with the card, ・Reliable multilingual support: Supports 25 languages ​​(some languages ​​may not be available at all times)*

*As of July 2025, the app is available in seven languages.

Credit card

Solves the problem of rooms without internet

In Japan, there are many rental properties that do not come with internet access from the start.
When applying for home internet, you may need a Japanese phone number, which can be a major hurdle for foreigners who have just arrived in Japan. Furthermore, there are many factors that can cause anxiety, such as the complexity of the procedures and the language barrier, and many people are unable to take the plunge and apply.

Even in such situations, you can rest assured with GTN Mobile.
First, a SIM with voice communication will secure you with a communication environment and a Japanese phone number, which will then allow you to smoothly apply for home internet.
Even if you are not satisfied with just mobile data or live in a room without internet access, you can gradually set up your communication environment in Japan.

If you're unsure whether to choose fiber optic or home Wi-Fi, GTN Mobile staff will be happy to assist you in your native language. They will provide thorough support, from choosing a plan to applying and registering, based on your room environment and usage style.

Home Internet Service

"GTN Wi-Fi MAX" - Mobile Wi-Fi that can be used immediately without any construction work

For those who cannot wait for their home internet installation or who need high-capacity data immediately,
The high-capacity mobile Wi-Fi router "GTN Wi-Fi MAX" is also available.

No installation is required and you can start using it immediately from the day you receive it, making it a convenient means of communication after arriving in Japan or moving.

GTN Wi-Fi MAX Features
・Application required only with passport ・Can be used throughout Japan ・Up to 10 devices can be connected simultaneously ・300GB of data per month ・Free device fee (Wi-Fi router rental fee 0 yen*)

*A deposit of 10,000 yen is required at the time of application. After returning the Wi-Fi router, the full amount will be refunded once we confirm that there are no outstanding payments.

Furthermore, if you use the internet service in addition to the SIM card, you will receive a set discount of 330 yen per month, allowing you to keep your communication costs down without waste.

GTN Wi-Fi MAX

Convenient international services for safe and secure connections with overseas

Even after starting life in Japan, many people want to stay in contact with family and friends from their home country.
The international services provided by GTN Mobile can be useful in such situations.
There are international calling services available without the need for a subscription, as well as services that allow you to send mobile charges overseas, so you can stay connected with the rest of the world without worrying about leaving Japan.

International telephone service "GTN Dial"

GTN Dial is a service that makes calling overseas easier and more affordable.

・No application required ・Can be used immediately from the GTN Dial app ・Basic fee is 0 yen ・Supports calls to over 190 countries and regions

Recommended for those who want to easily contact family and friends overseas.

GTN Dial

International mobile charge "GTN Top UP"

GTN Top UP is a service that allows you to send data and calling balances to the mobile phones of family and friends overseas.

・Can send to over 150 countries ・Can be used with simple procedures ・Can be used without fees

This is a convenient service for those who want to support their family's mobile phone bills in their home country or who want to send a charge to a friend overseas.

GTN Top UP

More than just a SIM, start your life in Japan with GTN Mobile!

GTN Mobile has a long history of supporting foreigners' lives in Japan, and has comprehensively resolved the inconveniences faced by foreigners living in Japan by providing comprehensive support beyond communications, including payment, lifestyle support, and preparations before arriving in Japan. With many years of experience and a multilingual support system, we can help you live in Japan more safely and smoothly. First, check with GTN Mobile to find the plan that's right for you.

GTN Mobile official website

GTN Mobile