How to Get a SIM Card or Internet in Japan: Best Options for Foreign Residents

2026年4月21日

How to Get a SIM Card or Internet in Japan: Best Options for Foreign Residents

The simplest setup for most foreign residents is this: get a voice + data SIM or eSIM first, then choose home internet based on how long you will stay and whether your apartment allows installation work.

If you are staying only a few weeks, a tourist eSIM or pocket Wi-Fi is enough. If you are moving into an apartment for school or work, a Japanese phone number is usually worth getting early because banks, delivery companies, schools, employers, and government offices often ask for one.

Quick guide:

First 1 to 4 weeks: tourist eSIM, prepaid SIM, or pocket Wi-Fi
Several months to 1 year: low-cost SIM/eSIM or home router
1 year or longer: voice + data mobile plan plus fiber internet if your building supports it
Remote work or heavy streaming: fiber first, home 5G only if construction is difficult

As of April 2026, online identity checks for some mobile contracts have also become stricter. Some carriers now require an NFC-capable smartphone to read the IC chip in a My Number card, driver’s license, residence card, or special permanent resident certificate. This matters most when applying online for voice/SMS plans or switching carriers.

Who This Guide Is For

This guide is for people who are already in Japan or about to move here for study, work, family, or a long stay.

It is especially useful if you need to decide between:

a tourist SIM and a resident mobile plan
a physical SIM and an eSIM
a cheap MVNO and a major carrier
fiber internet and a plug-in home router
Japanese-only plans and services with English support

The best option depends less on nationality and more on your real situation: your length of stay, your address, your ID documents, your phone model, your Japanese ability, and whether your building allows internet construction.

The Best Option by Situation

Start with the thing you need immediately. For most new residents, that is mobile data and a Japanese phone number.

If You Just Arrived

Use a short-term eSIM, prepaid SIM, or pocket Wi-Fi while you complete move-in tasks. This avoids being stuck without maps, messaging, translation, or train information during the first week.

This is a temporary setup. Many short-term products are data-only, may not include a Japanese phone number, and can become expensive if used for months.

Best for:

tourists
exchange students before getting a residence card
workers waiting for housing or bank setup
people whose phone is not yet ready for a Japanese resident plan

If You Are Staying Several Months or Longer

A resident SIM or eSIM with voice + data is usually the better base. A Japanese phone number helps with delivery forms, job applications, school contact, bank procedures, and two-factor authentication.

Budget mobile providers can be cheaper, but they may have limited English support and stricter online application requirements. Major carriers and their online brands may be easier for coverage and shops, but not always easier in English.

If You Need Home Internet

For home internet, choose by housing first:

If your apartment already has fiber equipment, fiber can be the best long-term option.
If construction needs landlord or building approval, expect delays.
If you cannot wait or cannot drill/install a line, a plug-in home router may be simpler.
If you move often, pocket Wi-Fi or mobile tethering may be more flexible than a fixed line.

Here is the practical rule: choose mobile service for your first days in Japan, then choose home internet only after you know your address, building type, and expected length of stay.

Main Options Compared

The prices below are examples from public carrier pages and typical market ranges. Always check the provider’s current campaign, contract period, device fee, and cancellation rules before applying.

Option	Good For	Typical Cost	Main Catch
Tourist eSIM or prepaid SIM	First days, short stays, temporary setup	Varies by data amount and days	Often data-only; may not give a Japanese phone number
Resident voice + data SIM/eSIM	Students, workers, long-term residents	About ¥1,000 to ¥3,500+ per month depending on data	ID check, payment method, and Japanese support vary
Major carrier or online brand	Coverage, stable service, shops, large data plans	Example: ahamo is ¥2,970/month for 30GB	Online procedures may require Japanese apps or IC-chip ID checks
Home 5G / home router	Rentals, no construction, quick home Wi-Fi	Examples: docomo home 5G ¥5,280/month; SoftBank Air ¥5,368/month	Speed depends heavily on address and congestion
Fiber internet	Remote work, video calls, gaming, families	Often around ¥4,000 to ¥6,000+ per month before options and campaigns	May need installation work, building support, and separate provider details

What Documents You Usually Need

For a resident mobile contract, expect to prove who you are and where you live. The exact list changes by carrier and application method.

Commonly requested items include:

residence card or special permanent resident certificate
passport in some cases
Japanese address
credit card, debit card, or Japanese bank account
email address
compatible unlocked phone
NFC-capable smartphone for some online identity checks

For home internet, you may also need:

apartment name and room number
landlord or management company approval if installation work is required
permission to enter common building areas for construction
a Japanese phone number for scheduling installation

Do not assume that a passport alone is enough for a long-term resident mobile plan. A passport may work for some visitor products, but resident contracts normally require address and identity confirmation that matches the service rules.

The April 2026 Identity Check Change

The important update for foreign residents is not that mobile service disappeared. It is that some online sign-up flows now rely more on IC-chip identity verification.

KDDI’s povo2.0 notice says that, due to revisions connected to the Act on Prevention of Unauthorized Use of Mobile Phones, it changed identity verification methods for new voice + data contracts from March 25, 2026, ahead of the April 1, 2026 enforcement date. The new methods include JPKI using My Number cards or IC-chip reading plus facial recognition using documents such as My Number cards, driver’s licenses, and residence cards.

IIJ also announced changes for IIJmio personal MVNO identity verification from mid-January 2026. Its notice says customers may need an NFC-capable smartphone and a dedicated identity verification app for certain online procedures.

For foreign residents, this means:

Online applications may fail if your phone cannot read IC chips.
A residence card can be accepted by some services, but the exact method depends on the carrier.
Address mismatches can cause problems, especially after moving.
In-person store procedures may differ from online procedures.
Some older document-upload methods are being reduced or phased out by certain providers.

This is one reason to avoid leaving mobile setup until the night before a bank appointment, job start, or school registration.

Physical SIM or eSIM?

Both can work well in Japan. The better choice depends on your phone and how quickly you need service.

Choose eSIM If

your phone supports eSIM and is unlocked
you want quick activation
you are comfortable with QR codes, apps, and online setup
you do not need to move the SIM between phones often

Rakuten Mobile says eSIM activation can be quick when applying through eKYC with a compatible eSIM device. That is useful for residents who can complete the identity check smoothly.

Choose a Physical SIM If

your phone does not support eSIM
you may change phones
you prefer store help
your online ID check is failing
you want a simpler fallback if something goes wrong

The hidden issue is not the SIM format itself. It is compatibility. Before applying, check that your phone is unlocked and supports the carrier’s frequency bands. Phones bought overseas may work for data in cities but perform poorly in rural areas or indoors if key bands are missing.

Mobile Carrier Choices in Plain English

Japan has major mobile network operators, online brands, and MVNOs. MVNOs use another carrier’s network and are often cheaper, but support and speed during crowded times can vary.

Major Carriers

NTT docomo, au/KDDI, SoftBank, and Rakuten Mobile operate large mobile services in Japan. They are often easier to recognize, and shop support can help when procedures are complicated.

They may be a good fit if you:

need stronger nationwide coverage
want shop support
use a lot of data
need family discounts or bundled services
prefer a well-known carrier for work or family use

Rakuten Mobile’s English plan page lists a tiered Rakuten SAIKYO Plan, with monthly prices based on data use: ¥1,078 up to 3GB, ¥2,178 for more than 3GB up to 20GB, and ¥3,278 for over 20GB, with conditions and possible speed restrictions. ahamo’s Japanese plan page lists 30GB for ¥2,970/month and 110GB with the large data option for ¥4,950/month.

These examples are useful because they show the current shape of Japan’s mobile market: simple online plans can be cheaper than old-style bundled contracts, but the application flow may not be fully English-friendly.

MVNOs and Budget SIMs

MVNOs can be a strong choice for students, light users, and people who mainly use Wi-Fi at home or school. They usually cost less, but there are trade-offs.

Check carefully for:

voice calling support
SMS support
eSIM availability
English help pages
payment methods
cancellation rules
speed during lunch hours and evenings
whether the plan supports MNP, meaning number transfer from another carrier

A cheap plan is not cheap if you cannot complete the ID check, receive bank SMS codes, or contact support when the SIM stops working.

Home Internet: Fiber, Home Router, or Pocket Wi-Fi?

Home internet is where many new residents make expensive mistakes. The fastest option is not always the best first option.

Fiber Internet

Fiber is usually best for long-term residents who need stable home internet for remote work, online classes, gaming, or family use.

NTT East describes FLET’S Hikari as an optical fiber broadband service for homes, apartments, and offices. NTT West’s English pages also show FLET’S Hikari services for single-family homes and apartment complexes, including 1Gbps-class and 10Gbps-class services depending on area and plan.

The key point: fiber availability depends on your exact address and building. Even if fiber exists in your city, your apartment may have a different connection type, a building contract, or no available installation route.

Before applying, ask:

Is fiber already installed in the room or building?
Which providers are allowed in this building?
Is construction work needed?
Who must approve the work?
Is the advertised speed maximum or actual expected speed?
Are the line and internet provider billed together or separately?

Home 5G and Plug-In Routers

Home routers are easier. You plug in the device and use mobile network signal at your registered address.

docomo’s home 5G page lists a monthly charge of ¥5,280 and says no on-site installation is needed. SoftBank Air lists a basic monthly fee of ¥5,368 and also promotes no installation work. These products can be good for rentals where construction is difficult.

The trade-off is performance. Speed depends on the signal at your address, building materials, network congestion, and 5G coverage. A home router can be excellent in one apartment and disappointing in another building a few streets away.

Pocket Wi-Fi

Pocket Wi-Fi works best as a bridge, not always as a permanent home setup. It is portable, easy to start, and useful when you are waiting for fiber installation.

It may be weaker for:

long video meetings
heavy cloud backups
online gaming
multiple people using it every night
unlimited home use under fair-use restrictions

Steps to Get Connected

Use this order if you are moving to Japan and want to avoid delays.

1. Check Your Phone First

Before buying any plan, confirm that your phone is:

unlocked
compatible with Japanese carrier bands
able to use eSIM if you want eSIM
able to read NFC chips if the application requires IC-chip verification

If your phone is locked to an overseas carrier, solve that before arrival if possible.

2. Get Temporary Data

Arrange a short-term eSIM, prepaid SIM, or pocket Wi-Fi for arrival. You need maps, translation, messaging, and email before you can solve bigger tasks.

3. Register Your Address

If you are a mid- to long-term resident, register your address at your municipality after moving in. Mobile and banking procedures are easier when your address information is current and consistent.

4. Choose a Resident Mobile Plan

Pick based on your real use:

light data: budget SIM or low-data tier
many calls: check call fees and app-based calling rules
heavy data: large-data online brand or Rakuten-style tiered plan
rural travel: check coverage maps carefully
weak Japanese: prioritize support and store access over the lowest price

5. Choose Home Internet After Housing Is Clear

Do not order fiber blindly before checking your building. Ask the real estate agent, landlord, or management company which lines are available and whether construction is allowed.

If you need internet immediately, use mobile tethering or a home router while waiting.

Common Mistakes

Most problems come from applying too early, too cheaply, or with mismatched information.

Avoid these mistakes:

Buying a data-only SIM for long-term life: You may still need a Japanese phone number for banks, delivery, work, and school.
Ignoring phone compatibility: An unlocked phone is not automatically a good match for every Japanese network.
Using an old address: Address mismatches can break ID checks and delivery.
Assuming English support: Many official application pages and support flows are still Japanese-heavy.
Forgetting building permission: Fiber installation may require approval and scheduling.
Only checking monthly price: Device fees, router rental, options, campaign end dates, and cancellation costs can change the real cost.
Trusting maximum speed numbers: Carrier pages often show technical maximums. Actual speed depends on area, congestion, device, and building conditions.

Regional and Housing Differences

Japan-wide advice has limits because telecom service is address-based.

Mobile coverage varies by:

urban vs rural area
underground stations and basements
mountains, islands, and coastal areas
carrier frequency bands
5G availability

Home internet varies by:

NTT East or NTT West service area
detached house vs apartment
building wiring
landlord rules
existing condominium internet contracts
whether construction slots are available

Tokyo and other large cities usually have many options, but apartment buildings can still limit choices. In rural areas, a major carrier with stronger local coverage may matter more than saving a few hundred yen per month.

FAQ

Do I Need a Japanese Phone Number?

For a short trip, no. For living in Japan, usually yes. A Japanese number helps with banks, delivery, job applications, school forms, clinics, government offices, and SMS verification.

Can I Get a SIM Before I Have a Residence Card?

You can usually get tourist or short-term products with a passport, depending on the provider. Resident voice plans normally require stronger identity and address confirmation. If you are arriving for work or school, use temporary data first and switch later.

Is eSIM Better Than a Physical SIM?

eSIM is faster when everything works. Physical SIM is easier to troubleshoot and move between devices. Choose based on your phone, ID check method, and comfort with online setup.

Is Fiber Always Better Than Home 5G?

Fiber is usually better for stable heavy home use. Home 5G is better when you cannot wait for construction, cannot get landlord approval, or expect to move soon.

Can I Use My Mobile Plan as Home Internet?

Yes, if tethering is allowed and your data amount is enough. It can work for one person with light use. It is not ideal for heavy remote work, large downloads, or several devices every day.

Practical Takeaway

For a foreign resident, the best setup is usually built in two stages:

Get temporary data for arrival.
After your address and documents are ready, get a resident voice + data plan.
Add fiber if you will stay long enough and your building supports it.
Use a home router if you need quick Wi-Fi without installation.

The next thing to check is not a ranking site. It is your own situation: phone compatibility, residence card status, address, payment method, building rules, and whether the carrier’s online identity check will work with your device.

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