Posted on
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By
Clay Thomas
If you are coming to Japan for a school trip, language course, exchange program, internship, or study-abroad program, you will probably be using mobile data every day for maps, train schedules, school email, translation apps, video calls, and everything else you need while getting settled.
Many Japanese mobile phone plans are designed for residents and may require a Japanese address, identity verification, or other local documentation that short-term students may not have. For students staying a few weeks to a few months, an eSIM is usually the simplest option.
If you are staying in Japan longer, an eSIM can also be useful when you first arrive and are still completing your residence registration, setting up a local address, or getting the documents and payment methods required by the mobile provider you eventually want to use.
You can use a travel eSIM for data during those first weeks, then switch to a Japanese mobile plan later if you need a local phone number for school, work, SMS verification, or other services.
In this guide, we'll compare some of the best Japan eSIM and mobile options for students, starting with the plans that make the most sense for short-term stays and newly arrived international students.
1. Journey Japan eSIM
Journey Japan eSIM is a Japan-focused eSIM service founded by Chris Broad, the creator of the popular Abroad in Japan YouTube channel.
Unlike global eSIM marketplaces that sell plans for dozens or hundreds of countries, Chris started Journey Japan eSIM specifically for people traveling to Japan, with its plans, network coverage, and support focused entirely on the country.
This is what makes it a strong option for students coming to Japan for a school trip, summer program, language course, internship, or short exchange who mainly need reliable mobile data.
It also works well for students staying longer who want something they can use immediately after arriving, before they set up a Japanese address, complete local registration, or choose a longer-term mobile plan with a Japanese phone number.
Set It Up Before You Arrive in Japan
You can purchase a Journey Japan eSIM online before your trip and install it on your phone while you still have a reliable internet connection at home.
Once you arrive in Japan, the eSIM can connect to the supported local network, so you do not have to look for a SIM card shop or arrange a Japanese mobile contract as soon as you land.
That can be especially useful during your first few days when you may already be using your phone for train routes, directions to your accommodation or campus, LINE, school emails, translation apps, and communication with your family.
No Japanese Mobile Contract Required
Journey Japan eSIM is a prepaid travel eSIM, so you do not need to sign up for a conventional Japanese monthly mobile contract just to get data.
That makes it particularly useful for short-term students who may not have a Japanese residential address or the documentation some local mobile providers require.
Longer-term students can also use it while they complete their local setup and decide whether they eventually need a Japanese phone number or monthly mobile plan.
Fixed Data and True Unlimited Plans
Journey Japan eSIM currently offers fixed-data plans with 10GB, 20GB, and 50GB, along with True Unlimited plans for students who expect to use much more data.
A fixed-data plan may be enough if you mainly use your phone for maps, LINE, email, browsing, and occasional social media.
Students who expect to make frequent video calls, stream video, upload large files, use cloud services, or rely heavily on mobile data may prefer an unlimited plan.
Journey Japan eSIM's True Unlimited plans do not have a published daily high-speed data allowance that reduces your speed after you use a certain number of gigabytes each day.
Hotspot for Your Laptop
Hotspot access can be particularly useful for students who need to connect a laptop or tablet when campus, dorm, or café Wi-Fi is unavailable or unreliable.
Journey Japan eSIM supports hotspot and tethering, although the hotspot allowance can be separate from the main mobile-data allowance depending on the plan.
Check the hotspot terms for the specific plan you choose if you expect to use your phone regularly for online classes, coursework, video calls, or laptop access.
Coverage Across Japan
If you are studying outside Tokyo or Osaka, or plan to travel to more rural parts of Japan for field trips, homestays, or weekend trips, you will need more reliable coverage than someone staying mainly in the major cities.
Journey Japan eSIM uses major Japanese networks such as NTT Docomo and KDDI, depending on the plan, so it is a better fit for students who expect to spend time outside the main urban areas.
2. Sakura Mobile
Sakura Mobile is a better fit for students staying in Japan for several months who want a monthly plan with a Japanese phone number rather than a data-only travel eSIM.
Its monthly Voice + Data plans are available as either a physical SIM or eSIM and use NTT Docomo's 5G/4G network. Current plans start at ¥3,278 per month including tax for 5GB, with larger 15GB, 30GB, and higher-data options available.
Sakura Mobile also offers a student discount on its monthly services. Students can verify their status with documents such as a student ID, admission letter, or recent transcript. The discount currently reduces the activation fee by ¥1,100.
For short-term students, Sakura also has travel eSIMs that do not require ID when ordering, although these are data-only and do not include a Japanese phone number. Sakura itself recommends its travel products for stays under 90 days and monthly products for longer stays.
If you are staying for a semester or academic year and expect to need a Japanese number for calls or SMS, Sakura Mobile is one of the more student-friendly long-term options to consider.
3. Mobal
Mobal is another option specifically designed for foreigners living, working, or studying in Japan.
Its long-term eSIMs can provide a standard Japanese 070, 080, or 090 phone number along with SMS and data. Current Voice + Data plans start from ¥1,650 per month, and Mobal does not require a minimum contract period, so you can cancel when you no longer need the service.
This can be useful for international students who discover that they need a local number for SMS verification or other services after arriving in Japan.
The signup process is more involved than purchasing a data-only travel eSIM because Japanese voice services are subject to identity-verification requirements.
Mobal's voice eSIM process may require ID verification and delivery or pickup of an eSIM access code rather than simply emailing you a QR code.
For that reason, Mobal makes more sense as a longer-term option than as the data connection you rely on immediately after landing.
4. GTN Mobile
GTN Mobile is particularly interesting for students because it offers both short-term prepaid products and longer-term Japanese mobile plans.
Its prepaid data eSIMs currently include:
10GB for 30 days — ¥3,000
50GB for 30 days — ¥5,000
135GB for 90 days — ¥10,000
The prepaid data service uses NTT Docomo and can be purchased without a residence-expiry requirement. GTN specifically recommends it for people who need temporary data before moving to a long-term SIM contract.
GTN also sells prepaid Voice + Data plans with Japanese calling and SMS for 30, 60, and 90 days, although these require an in-store purchase and identity documents.
GTN currently provides customer service in 13 languages, including English, Chinese, Korean, Vietnamese, Nepali, Hindi, and several others.
GTN is worth considering if your program lasts longer than the typical one-month travel eSIM period, especially if you want a prepaid option rather than committing to an ongoing monthly service.
5. Ubigi
Ubigi is a good alternative for students who only need mobile data and prefer an eSIM they can continue topping up rather than installing a new profile for every plan.
Its current 30-day unlimited Japan plan costs $65 and uses both KDDI and NTT Docomo. The plan allows data sharing and can be topped up through the Ubigi app.
Ubigi currently provides up to 60GB at full speed on this plan, after which the connection is reduced to 2Mbps for the remainder of the 30 days.
Ubigi is data-only, so it will not provide the Japanese number that a longer-term student may eventually need. It does, however, work well for LINE, WhatsApp, school email, Maps, video calls, and other internet-based services.
The reusable eSIM and in-app top-ups can also be convenient for students who plan to travel elsewhere in Asia during school breaks.
6. Airalo
Airalo is one of the largest international eSIM providers and can make sense if you already have the app and use it when traveling to other countries.
For Japan, Airalo currently offers both fixed-data and unlimited plans. Its 30-day fixed packages include options such as 5GB for $11, 10GB for $18, and 20GB for around $25.
Airalo provides 3GB of high-speed data every 24 hours and then reduces the speed to 1Mbps until the daily allowance resets.
Airalo uses SoftBank as its primary Japan network along with an additional supported network and lets you install the eSIM before arriving.
It is a reasonable option for short-term students, particularly lighter users, although students comparing unlimited plans should look closely at the daily high-speed allowance rather than the word "unlimited" alone.
7. Saily
Saily is worth considering for students who want an inexpensive data-only plan and do not expect to use large amounts of mobile data.
Its current Japan plans include:
1GB for 7 days — $3.99
3GB for 30 days — $7.99 before promotions
5GB for 30 days — $10.99
10GB for 30 days — $17.99
20GB for 30 days — $24.99
Saily also offers unlimited data, although the structure is different from Journey Japan eSIM's True Unlimited plans. Its current unlimited option provides 5GB of unrestricted-speed data per day, after which you can continue using data at up to 1Mbps.
For a student who mainly needs Maps, LINE, school email, browsing, and occasional social media, one of the lower-cost fixed plans may be enough.
Students who expect frequent video calls, streaming, large downloads, or heavy laptop use will probably want a larger allowance or a different unlimited plan.
8. Rakuten Mobile
Rakuten Mobile is different from the travel eSIMs above because it is a full Japanese mobile carrier.
It makes more sense for students who are actually living in Japan for a semester, academic year, or longer and want an ongoing Japanese phone service.
Rakuten supports eSIM and provides a Japanese mobile number, calling, SMS, and monthly data. Its current Rakuten SAIKYO Plan uses usage-based pricing, with unlimited data available for ¥3,168 per month including tax before applicable discounts.
There is also a SAIKYO YOUTH Discount for customers through age 22, currently reducing the monthly charge by ¥110.
Rakuten requires identity verification, and foreign nationals may need a residence card or another accepted document depending on the application method.
Rakuten's online eKYC currently supports residence cards and special permanent resident certificates for foreign nationals.
Rakuten is a better option after you have settled in Japan and have the necessary documentation, rather than something most short-term students would arrange before their flight.
Factors to Consider When Choosing a Japan eSIM for Students
The best option depends less on whether you are a student and more on how long you will be in Japan, how much data you expect to use, and whether you need a Japanese phone number.
How Long You'll Be in Japan
If your program lasts a few days to around a month, a prepaid travel eSIM is usually the easiest option. You can buy it before your trip, use it for the duration of your stay, and avoid setting up a monthly Japanese phone contract.
Students staying for several months have more options. You may want to use a travel eSIM when you first arrive and then switch to a Japanese monthly plan once you have settled in and know what you actually need.
For a semester or full academic year, compare the cost of repeatedly buying prepaid data with a monthly Japanese plan, especially if you also need a local phone number.
Whether You Need a Japanese Phone Number
Many short-term students only need mobile data.
If you mainly use LINE, WhatsApp, FaceTime, school email, Google Maps, translation apps, and other internet-based services, a data-only eSIM such as Journey Japan eSIM may be enough for your entire stay.
A Japanese phone number becomes more useful for longer-term students. Your school, employer, bank, or certain Japanese services may ask for a local number or SMS verification.
If you expect to need one, look for a plan that includes Japanese voice and SMS rather than choosing a travel eSIM based on data alone.
How Much Data You Expect to Use
Your data needs can vary considerably depending on how you use your phone.
If you mainly use maps, messaging, email, and browsing, a fixed-data plan may be enough.
You will likely use more data if you regularly:
Make video calls
Stream video or music
Upload photos and videos
Download large course materials
Use cloud storage
Attend online classes
Share your connection with a laptop
Students who expect heavier use may prefer a larger fixed-data allowance or an unlimited plan.
You should also check what a provider means by unlimited. Some plans allow unlimited high-speed data, while others reduce your speed after you use a certain amount each day or month.
Hotspot and Laptop Use
If you expect to study from your laptop, check the hotspot policy before choosing an eSIM.
You may need your phone's connection when dorm Wi-Fi is unavailable, when you are studying away from campus, or when you need to join a class or submit coursework from your laptop.
A plan with unlimited phone data does not necessarily include unlimited hotspot data. Some providers set a separate daily or total tethering allowance, so check this separately from the main data limit.
Network Coverage
If you are studying mainly in central Tokyo, Osaka, or another large city, most major Japanese networks should provide strong coverage.
If your university, language school, homestay, or internship is outside the major cities, or you plan to travel around Japan during weekends and school breaks, the network behind your eSIM becomes more important.
Look at whether the plan uses NTT Docomo, KDDI/au, SoftBank, or another Japanese network rather than comparing providers only by price.
Documentation and Signup Requirements
Travel eSIMs are generally easier for newly arrived students because you can purchase them online as prepaid data products without setting up a conventional Japanese mobile contract.
Longer-term voice and data plans may involve additional requirements such as identity verification, a Japanese address, residence documentation, or specific payment methods.
If you are considering a longer-term plan, check what documents you need before assuming you can complete the application immediately after arriving.
This is also why a travel eSIM can be useful during your first few weeks in Japan. You can stay connected while you complete your local registration and arrange the documents needed for the mobile plan you eventually choose.
Whether You Want to Keep Your Home Number Active
Students staying abroad may still need access to their existing phone number for bank verification codes, university accounts, account recovery, or messages from home.
If your phone supports Dual SIM, you can often keep your home SIM active while using a Japanese eSIM for mobile data.
Make sure the Japan eSIM is selected as your mobile-data line so your phone does not accidentally use your home carrier for data roaming.
Also check your home carrier's international roaming fees before leaving the line active, especially if you plan to receive calls or send SMS messages while in Japan.
Which Japan eSIM Should Students Choose?
If you are coming to Japan for a school trip, summer program, language course, internship, or short exchange, a prepaid travel eSIM is usually the easiest way to stay connected.
Journey Japan eSIM is especially well suited to short-term students because it offers fixed-data and True Unlimited plans, runs on major Japanese networks, and can be set up before your trip.
If you are staying longer, it can also give you mobile data during your first few weeks while you settle in and decide whether you need a Japanese phone number or a longer-term monthly plan.
If you only need data, you can choose a Journey Japan eSIM plan before you travel and have your connection ready for when you arrive in Japan.
