SIM Cards in Japan: Top 7 Services for Travelers in 2025

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Stay connected in Japan by using a SIM card! We introduce 7 Japanese SIM cards ideal for short stays along with information on eSIM and the pros and cons of using a SIM card compared to portable Wi-Fi routers.

Written by

Mizzochi

Mitoyo, Kagawa, Japan

I worked in a PR agency for corporate IR/CSR and a publisher which publishes a magazine focused on international cooperation before joining MATCHA in October 2017.

In April 2019, I moved to Mitoyo City in Kagawa Prefecture. I write articles for tourists visiting Japan, and also contribute to regional revitalization.

My main focus is on writing about internet services, rental cars, hotels, and tourist attractions in western Japan.

Stay Connected in Japan

There are several ways to access the Internet in Japan. The most inexpensive method would be to use free WiFi but its availability is limited and can expose users to vulnerabilities.

A SIM card for travelers or portable WiFi router comes in handy in these situations. While the latter can handle a large amount of data, carrying the device around may require some effort.

Alternatively, a SIM card may only handle a little data and is more complicated to set up than a portable WiFi. But it is far easier to carry and cheaper than a router.

This article features seven SIM cards that will support your short-term trip to Japan. We've also included information on eSIM services and inexpensive portable WiFi routers that are an alternative to SIM cards.

Top 7 SIM Cards in Japan: A Comparison

1. NINJA WiFi SIM
2. mobal
3. Sakura Mobile
4. Nippon SIM for Japan
5. IIJmio Travel SIM
6. Klook
7. J Wifi ＆ Mobile(Vending Machines at Airports)
eSIM: An Alternative to Physical SIM Cards
Low-Cost Pocket Wi-Fi Routers
The Advantages and Disadvantages of SIM, eSIM, and Pocket WiFi

Top 7 SIM Cards in Japan

While there are many types of SIM cards to use when traveling in Japan, the following is a list of five recommended providers and two places to purchase them.

NINJA WiFi SIM
Price for Basic Plan	3,795 yen and up * (with discount: 3,415 yen/day
Data Capacity	1GB per day/7days and up
Benefits	- High reliability - Cost-efficient plans for a 1 to 2-week trip - Plans with unlimited data also available
HP	NINJA WiFi SIM

mobal
Price for Basic Plan	4,730 yen and up
Data Capacity	25GB/8 days and up
Benefits	- No shipping fee
HP	mobal

Sakura Mobile
Price for Basic Plan	3,850 yen and up
Data Capacity	Unlimited (Data speed may be reduced after exceeding 3GB per day)/5 days and up
Benefits	- Reliable customer support
HP	Sakura Mobile

Nippon SIM for Japan
Price for Basic Plan	1,980 yen and up
Data Capacity	3GB/30 days and up
Benefits	- Available for purchase on Amazon
HP	Amazon

IIJmio Travel SIM
Price for Basic Plan	2,480 yen and up
Data Capacity	3GB/30 days and up
Benefits	- Available at Japanese electronics retail stores
HP	IIJmio

Klook
Price for Basic Plan	3,500 yen and up
Data Capacity	Unlimited/5 days and up
Benefits	- Easy to make a reservation
HP	Klook

J Wifi ＆ Mobile(Vending Machines at Airports)
Price for Basic Plan	3,000 yen and up
Data Capacity	Unlimited/5 days and up
Benefits	- Easily purchasable at the airport.
HP	-

1. NINJA WiFi SIM: A Variety of Plans, Including Unlimited Data

Picture courtesy of NINJA WiFi

For a trip of one to two weeks in Japan, we recommend the SIM card plans offered by Ninja WiFi, which come with a reasonable amount of data.

NINJA WiFi is a service provided by Vision, a long-established company known for its Global WIFI brand in the internet service sector. It has received high praise for its diverse communication stability from both domestic and international users.

As of November 2024, NINJA WiFi offers six SIM card plans.

The plan that allows 1GB per day is available for 7 days and 15 days. Notably, the 15-day option is very affordable at 4,422 yen.

Additionally, plans with unlimited data are offered for 15 days, 20 days, and 30 days.

In the past, even when services claimed to offer "unlimited data" for SIMs and pocket WiFi, there were often restrictions on communication speeds if you used around 3GB in a day. However, with NINJA WiFi SIM, there are basically no restrictions except during peak congestion periods.

Due to its high reliability, diverse plans, and reasonable prices, it NINJA WiFi is our top recommendation.

Right now MATCHA and NINJA WiFi are offering a 10% discount to buy the NINJA WiFi SIM!

10% Discount for MATCHA Readers! Purchase the NINJA WiFi SIM Card

*On the website, check Rate and Plans, where you can find details on the NINJA WiFi SIM Card plans.

2. mobal SIM Cards: No shipping fee

Picture courtesy of mobal

mobal, a long-established company headquartered in the UK, handles SIM cards for travelers to Japan.

They offer various SIM card plans, the cheapest with 25GB data costing 4,730 yen for 8 days. Please note that data speed may be reduced after exceeding 3GB per day.

Mobal cards can handle about the same amount of data as pocket Wi-Fi routers. Moreover, there is no shipping fee for worldwide customers, so overseas visitors can receive the card in their home country before arriving in Japan.

The company also handles Voice SIM, which comes with a Japanese telephone number. The duration is 30 days for 7GB costing 7,920 yen and up. Also, the trending eSIM is available for 8 days for 3GB starting at 2,340 yen.

Purchase the mobal SIM Card

3. Sakura Mobile SIM Card: Excellent Support in English

Picture courtesy of Sakura Mobile

Sakura Mobile is a popular service for English-speaking people who are traveling or staying in Japan for long periods.

Their SIM cards offer unlimited data (data speed may be reduced after exceeding 2GB per day) and cost 3,850 yen for 5 days. Although it may seem expensive compared to mobal, Sakura Mobile is known for its top-notch customer support.

The company will answer questions in advance and offer consultations during the trip if you have any problems. If this is your first trip to Japan or first time using a SIM card, we recommend choosing Sakura Mobile!

They also offer an eSIM service. While prices vary depending on the period of use, a 7-day package with unlimited data costs 4,620 yen as of August 2024.

Purchase the Sakura Mobile SIM Card

4. Nippon SIM for Japan: Available for Purchase on Amazon

Picture courtesy of Nippon SIM for Japan

Nippon SIM for Japan is provided by DHA Corporation and is available on Amazon.

A 30-day plan with 3GB data costs 1,980 yen. There are other plans with a wide variety of duration and data.

Since the capacity is small, this card is suitable for those who don't use much data and looking to buy a cheap SIM card.

5. IIJmio Travel SIM: Available at Japanese Electronics Retail Stores

Picture courtesy of IIJmio Travel SIM

Those planning to purchase a SIM card during their trip should look for IIJmio Travel SIM. It is sold at major electronics stores in most large cities, such as Bic Camera, Yodobashi Camera, and Kojima.

This is an open-priced item with costs varying by store. As of August 2024, a 30-day card with 3GB data is sold for 2,480 yen at Bic Camera.

IIJmio is a low-cost SIM service provider that is well-known in Japan.

Bic Camera×MATCHA Coupon! Maximum 17％ Discount

6. SIM Cards Offered by Klook: Easy to Purchase

Residents of southeastern or eastern Asian countries should check Klook, an experience booking site.

Klook also sells various SIM cards that are suitable for a trip to Japan. Most of them can be sent to various Asian countries, so please take a look!

Purchase a Klook SIM Card or Portable Wi-Fi Router

7. J Wifi ＆ Mobile(Vending Machines at Airports)

If you forget to purchase a SIM card in your home country, don't worry! In recent years, major Japanese airports are provided with SIM card vending machines.

For example, a 5-day SIM card with unlimited data* is sold for about 3,000 yen at vending machines in Narita Airport. Recently, eSIM with 50GB of data for 8 days are also being sold for 4000 yen.

Please check the official website for additional details.

*The internet speed is get slowly when you use a lot of data amount in a few days.

eSIM: An Alternative to Physical SIM Cards

Picture courtesy of NINJA eSIM

One of the concerns about using a SIM card is the risk of losing the SIM card when replacing it. After all, SIM cards are very small, measuring only 1 to 3 millimeters in size.

Recently, eSIM has been trending because it can be used without replacing the physical SIM card. In the U.S., the iPhone 14 series designed for eSIM use was released in 2022, and other carriers are expected to follow.

Companies in Japan are also offering this service.

For example, NINJA WiFi offers the Ninja eSIM for 3,102 yen (including tax) for 5 days with 5GB of data.

Additionally, companies like mobal and Sakura Mobile also provide their own unique eSIM plans.

If you're using a smartphone that supports eSIM, please check out these other companies as well.

Book NINJA eSIM

Low-Cost Pocket Wi-Fi Routers

Photo by Pixta

In most cases, a pocket Wi-Fi router handling a large quantity of data will be more expensive than a SIM card. However, this is not always the case.

For instance, NINJA WiFi router costs 770 yen/day with 3 GB/day. Furthermore, there is a 20％ discount via MATCHA and costs 3,080 yen for 5 days, which is a similar fee to SIM cards.

While it may be burdensome to carry a router, it allows multiple devices to access the Internet with no need to change SIM cards.

Please consider these facts when considering a portable Wi-Fi router.

Book you NINJA WiFi at a 20％ Discount

Advantages and Disadvantages of SIM, eSIM, and Pocket WiFi

We are introducing pros and cons of Pocket Wifi, SIM cards, and eSIM in a video. If you are undecided between Pocket Wifi and eSIM, please take a look at this first.

We compared the benefits and drawbacks of SIM cards, eSIMs, and Pocket WiFi in video format. If you want to learn more, please check it out!

FAQ

Is a Voice SIM or data-only SIM a better choice?

Voice SIM comes with a Japanese telephone number while data-only SIM does not.
With WhatsApp, Messenger, and LINE becoming popular messaging apps, some may wonder why you need a Japanese phone number if you're not a resident.

But a phone number has its advantages. Firstly, users can phone the police or fire department when trouble occurs. Emergency calls can be made in other languages besides Japanese, so this is a major feature.

To apply for various services in Japan, such as the popular electronic payment app Pay Pay, users must register a phone number.

Those who are interested should check mobal, which handles Voice SIM cards suitable for short-term trips.

What does "unlimited data" mean?

In regards to data traffic, some SIM cards offer "unlimited" data usage.

Most of these types will easily handle 2 to 3 GB per day. However, exceeding this capacity will cause the speed to be reduced. While Internet accessibility remains, the flow of data will be considerably slower.

Can I change the SIM card of my smartphone?

If your smartphone is SIM-locked, the answer is no. While there are SIM-free phones in most Asian countries, some Japanese and American phones are locked.

There is a way to open these types of phones. Ask your carrier for information on how to unlock your smartphone.

Additionally, please note that some SIM cards may not be compatible with certain smartphone models. There is a compatibility list on the official websites of SIM card providers, so be sure to take a look!

How should I handle my original SIM card?

If you are going to change the SIM card in your home country, store the original in a dust-free place.Those who plan to replace the card in Japan should bring a SIM card case. It can be purchased on Amazon and other retailers.

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