Long-Term SIM Cards for Japan: Best Options for Extended Stays

Planning a stay in Japan that stretches beyond a month or two has a connectivity problem that most travel blogs ignore: the SIM card you picked up at Narita for a two-week holiday is completely wrong for a six-month working holiday or a semester studying in Tokyo. In 2026, the eSIM market has expanded rapidly, which is good news — but it has also flooded the Options, making it genuinely difficult to know which service will still be active and billing reliably when month four rolls around. This guide cuts through that noise with specific providers, real prices, and honest assessments of what works for extended stays.

Why Short-Term SIMs Fall Apart After 30 Days

Most tourist SIM cards sold at airport vending machines and convenience stores are engineered for trips of 7 to 15 days. A few push to 30 days. Beyond that, the model breaks: validity expires, data runs out, and you are either repurchasing cards repeatedly or paying top-up fees that add up faster than a monthly plan would have. Free WiFi at JR stations and convenience stores like 7-Eleven, FamilyMart, and Lawson exists and is improving in 2026, but it requires registration at every new hotspot, cuts out between locations, and is genuinely unreliable for navigation while moving. Running Google Maps, LINE calls, and video meetings off patchy public WiFi during a months-long stay is not a strategy — it is a daily frustration.

For stays exceeding 30 to 90 days — whether you are on a working holiday visa, a student visa, or an extended tourist stay — you need a monthly subscription plan from a provider that does not require a Japanese bank account, a Japanese resident card, or a local address to sign up. That narrows the field considerably, and the providers below are the ones that actually meet that bar.

Mobal SIM and eSIM — Best for True Long-Term Non-Residents

Mobal is the most consistently recommended option for non-residents on extended stays, and in 2026 it remains the strongest single choice. It runs on the SoftBank network, which provides excellent 4G coverage nationwide and expanding 5G in urban centres. Critically, it does not require a Japanese bank account, a registered address, or a resident visa — just a passport and an international credit card.

Plans as of early 2026 break into two main categories. The Unlimited Data and Calls Plan runs approximately JPY 5,000 to JPY 5,500 per month. It includes unlimited domestic calls and SMS, with speeds that may be throttled after heavy usage in the 50GB to 100GB range within a 30-day period — still more than adequate for most users. The Data-Only Plans sit around JPY 3,000 to JPY 4,000 per month for 20GB to 30GB, with no voice or SMS.

Ordering is done entirely online at mobal.com/japan-sim-card. Physical SIMs can be delivered to a hotel or Airbnb address in Japan, or picked up at counters at Narita, Haneda, Kansai, and Chubu airports. eSIMs arrive as a QR code by email and can be activated the moment you land. Payment accepts Visa, Mastercard, and American Express on a recurring monthly billing cycle.

Since 2024, Mobal has expanded its eSIM line and streamlined the online application so most users are set up in under ten minutes. Prices have risen modestly — roughly 3 to 5 percent annually — but the value proposition for someone who cannot get a local MVNO plan remains solid. English customer support is a genuine differentiator when something goes wrong.

Sakura Mobile — Strong Alternative on Docomo’s Network

Sakura Mobile runs on NTT Docomo, Japan’s largest and most widely tested network. For extended stays in rural areas, mountain regions, or smaller cities where SoftBank coverage occasionally thins out, the Docomo network can make a practical difference. Sakura Mobile’s target audience is explicitly foreign visitors and residents — English support is available, and no Japanese resident visa is required to sign up.

Monthly plan pricing as of early 2026 starts around JPY 3,500 to JPY 4,000 for 10GB of data, climbing to JPY 6,000 to JPY 7,000 for 50GB or more. Voice calls are offered as an add-on at approximately JPY 900 to JPY 1,500 per month extra, rather than bundled by default. Some plans include higher data caps with throttling after 100GB.

The official website is sakuramobile.jp. Airport pickup is available at Narita Terminal 1 and Terminal 2, Haneda Terminal 3, and Kansai International Airport. eSIMs are delivered by email. Activation is typically instant after setup. Since 2024, Sakura Mobile has improved its self-service online portal, meaning plan changes and billing queries can be handled without contacting support.

Compared to Mobal, Sakura Mobile is occasionally a slightly better deal for moderate data users who do not need voice calls and prefer Docomo’s network. For users who make frequent domestic calls, Mobal’s bundled unlimited call plan edges ahead on overall value.

IIJmio Japan Travel SIM — Viable for Medium-Term Stays Up to 3 Months

IIJmio is one of Japan’s most established MVNOs, running on both the NTT Docomo and au/KDDI networks. Its Japan Travel SIM product, however, is designed around fixed validity periods rather than true monthly subscriptions — and that distinction matters for longer stays.

As of early 2026, IIJmio Travel SIM packages run along these lines: approximately JPY 2,000 for 2GB valid for 30 days, JPY 3,000 for 5GB valid for 30 days, and JPY 4,500 for 10GB valid for 60 days. Data top-ups are possible via their online portal at t.iijmio.jp/en. Physical SIM cards are stocked at major electronics chains including Bic Camera and Yodobashi Camera, making them accessible without pre-ordering online.

For a two to three month stay where you are primarily using data, IIJmio is a legitimate and affordable option — just be prepared to log in and top up or repurchase regularly. For anything beyond three months, the administration overhead tilts the balance toward Mobal or Sakura Mobile. IIJmio’s regular monthly resident plans exist but require a Japanese resident card, a local address, and typically a Japanese bank account — none of which most long-term tourists have in the first months of their stay.

Data-Only eSIMs — Convenient but Limited for Long Stays

Global eSIM platforms like Airalo (airalo.com), Holafly, and Ubigi offer Japan-specific data packages that can be purchased and activated within minutes from any eSIM-compatible device. The eSIM market has grown sharply since 2024, device compatibility has increased substantially, and pricing has become more competitive.

Typical packages as of early 2026: 10GB for 30 days runs approximately JPY 2,500 to JPY 3,500, while 20GB for 30 days sits at around JPY 4,000 to JPY 5,500. Some providers offer 60-day or 90-day validity, but true ongoing monthly subscriptions from these platforms are rare. All plans are data-only — voice calls and SMS are not included, so communication relies on VoIP apps such as LINE, WhatsApp, or Skype.

For a stay of one to two months, a global eSIM platform can work well. For six months or more, repeatedly purchasing new packages adds friction and cost. The other meaningful advantage is the dual-SIM use case: with an eSIM handling Japanese data, you can keep your home SIM physically active in the same device for occasional use without carrying two phones.

Pocket WiFi Rental — When Sharing Connectivity Makes Sense

Pocket WiFi devices — portable hotspots that connect up to ten or more devices simultaneously — are still a viable option in 2026 for certain situations. Providers including Japan Wireless (japan-wireless.com), Ninja WiFi (ninjawifi.com), and eConnect Japan (econnectjapan.com) all offer airport pickup and postal return with pre-paid envelopes.

Monthly rental for an unlimited plan (with fair usage soft caps) typically runs JPY 6,000 to JPY 10,000 per month. Daily rates of JPY 500 to JPY 1,200 make more sense for very short trips. Devices have gotten smaller and battery life has improved modestly since 2024, but you are still carrying a second device that needs daily charging.

Pocket WiFi makes real sense in two scenarios: you are sharing a connection with a travel partner or colleague, splitting the cost between two or more people; or you need to connect a laptop or tablet consistently and prefer not to hotspot from your phone. For a solo long-term visitor, a monthly SIM plan from Mobal or Sakura Mobile will almost always be cheaper and simpler.

2026 Budget Reality — What You Will Actually Pay

• Budget (data-only, moderate usage): IIJmio Travel SIM at approximately JPY 3,000 to JPY 4,500 per month, or a global eSIM like Airalo at JPY 2,500 to JPY 3,500 for 10GB/30 days. Requires manual renewal. No voice calls.
• Mid-range (monthly subscription, data + voice): Mobal Unlimited Plan at JPY 5,000 to JPY 5,500 per month, or Sakura Mobile at JPY 4,500 to JPY 5,500 per month with a voice add-on. Auto-billing, English support, no Japanese bank account needed.
• Comfortable (pocket WiFi for multiple devices or heavy data use): Japan Wireless or Ninja WiFi monthly plan at JPY 6,000 to JPY 10,000. Higher data allowances, shareable connection, but an extra device to manage.

All prices reflect early 2026 figures. Minor inflationary adjustments of 3 to 7 percent have occurred since 2024, but competition in the tourist SIM market has prevented sharper increases.

Key Setup Rules Every Long-Term Visitor Must Know

1. Unlock your phone before you leave home. Japanese SIM cards and eSIMs from all providers will not work on a carrier-locked device. Contact your home carrier to unlock before you travel.
2. Bring your passport. Japanese law requires passport verification for SIM card registration, including data-only plans. This is a regulatory requirement, not an optional step.
3. Use an international credit card. Visa, Mastercard, and American Express are accepted by all major providers for online orders and monthly billing. Debit cards are accepted by some but not all — confirm before ordering.
4. Verify eSIM compatibility. Most flagship smartphones from 2022 onward support eSIM, but some regional variants and budget models do not. Check your device’s specifications before purchasing an eSIM plan.
5. VoIP for data-only plans. If your plan does not include voice calls, set up LINE or WhatsApp before you arrive. LINE is the dominant messaging and calling app in Japan, and most contacts you make in the country will be on it.

Mistakes That Cost People Money and Signal

Buying a short-term SIM and expecting it to last. A 15-day airport SIM is not designed to be renewed indefinitely. After validity expires, some go into a read-only state that requires purchasing a completely new card. Account for this before you land.

Assuming your phone is unlocked. Devices purchased through major US, UK, Australian, and European carriers are frequently locked. An unlocked confirmation from your carrier takes a few days and zero cost in most countries — do it before packing.

Relying on free WiFi for navigation. Standing at a Tokyo intersection at night, rain coming down, trying to load Google Maps on spotty FamilyMart WiFi from across the street is a genuinely miserable experience. A mobile data connection eliminates this completely.

Not checking throttling thresholds. “Unlimited” plans on Mobal throttle after 50GB to 100GB of usage in a 30-day period. For most users this is fine, but if you are streaming 4K video daily or working as a remote video editor, verify the threshold with the provider before committing.

Forgetting to cancel before leaving. Monthly plans from Mobal and Sakura Mobile bill automatically. If you do not cancel before leaving Japan, charges continue. Both providers handle cancellations online — set a reminder for two weeks before your departure date.

Frequently Asked Questions

Can I get a long-term SIM in Japan without a Japanese bank account?

Yes. Mobal and Sakura Mobile both offer monthly SIM and eSIM plans for non-residents using international credit cards. No Japanese bank account, resident card, or local address is needed. These providers exist specifically to serve long-term visitors who do not have resident status. Passport details are required at registration.

Is an eSIM better than a physical SIM for a long stay in Japan?

For most travellers in 2026, eSIM is more convenient — it activates instantly via QR code, requires no airport counter visit, and lets you keep your home SIM in the same device. The only limitation is device compatibility; some older or budget phones do not support eSIM. Check your model before choosing.

How good is mobile coverage in rural Japan?

Excellent by global standards. Japan’s 4G infrastructure covers the vast majority of rural areas, mountain towns, and smaller islands. NTT Docomo historically provides the broadest rural reach, which gives Sakura Mobile a slight edge for travellers planning extended time outside major cities. 5G is currently concentrated in urban zones and major rail corridors.

Do I need voice calls on my Japan SIM, or is data enough?

For most long-term visitors, data-only is sufficient if you use LINE, WhatsApp, or Skype for calls. However, some practical situations — calling landlords, booking appointments, or contacting government offices — benefit from a real Japanese phone number. Mobal’s unlimited plan includes voice calls and is worth the extra monthly cost if you expect to need this regularly.

What happens if I stay longer than expected and my plan expires?

Monthly plans from Mobal and Sakura Mobile roll over automatically as long as your card is charged successfully — there is no fixed end date forcing you to reapply. Fixed-validity SIMs like IIJmio Travel SIM will simply stop working after the validity window. For those, you either top up before expiry or purchase a new card through their portal at t.iijmio.jp/en.

📷 Featured image by masahiro miyagi on Unsplash.