Moving to Japan: Mobile Internet for Your First Months as an Expat (2026)

Moving to Japan rarely starts with a Japanese phone plan. Between landing at Narita, getting your residence card, opening a bank account and finding somewhere to live, signing a real contract with NTT Docomo or SoftBank takes weeks. Yet you need internet the moment you arrive. This guide explains how to stay connected during your first months as an expat in Japan, which plan fits your situation, and why a monthly eSIM subscription is the simplest bridge to your permanent Japanese line.

Why your first months as an expat are a connectivity problem

When people move to Japan, they often picture buying a local SIM the moment they land. Reality is slower. A standard Japanese mobile contract almost always requires three things: a residence card (在留カード, zairyū card), a fixed address registered at the ward office, and a local payment method — usually a Japanese bank account or a credit card issued in Japan.

Those pieces arrive in sequence, not all at once. The residence card is handed to long-stay visa holders at Narita, Haneda or Kansai airport, but the address registration (jūminhyō) happens afterwards at your ward office, once you have a place to live. The bank account often depends on that registration — and some banks require six months of residency before opening an account for a foreigner.

The result is a typical gap of three to eight weeks between arrival and the day you can sign a real carrier plan. During that window you still need Google Maps to reach your apartment, your banking app, real-time translation, and to stay reachable for every setup errand. That is exactly where a data eSIM shines: it asks for none of those documents.

The classic newcomer trap is relying on the free Wi-Fi in stations and konbini. It exists, but it is fragmented, often capped at 30 minutes, and gone the second you walk down the street looking for an address. For a relocation, continuous connectivity isn't a luxury — it's a daily working tool.

Japanese carriers: why it's hard on arrival

Japan's mobile market runs on four network operators: NTT Docomo, KDDI (consumer brand au), SoftBank and Rakuten Mobile. Docomo has the widest national coverage, including rural Tohoku and the Okinawa islands. Around them orbit dozens of MVNOs — IIJmio, mineo, y!mobile, UQ mobile, ahamo, povo, LINEMO — which rent the big networks and offer softer prices.

The problem isn't price, it's paperwork. Signing up with Docomo or au in store requires the residence card, proof of address and, very often, a Japanese bank account for the monthly direct debit. Some carriers still refuse foreign cards. According to Japan's Ministry of Internal Affairs and Communications (MIC), the telecom regulator, the market has opened up and cancellation fees have dropped, but entry conditions for a newly arrived resident stay heavy.

Rakuten Mobile is often named the most foreigner-friendly option, with online sign-up and tiered pricing. You can review its terms on the official Rakuten Mobile site. But it too needs a valid residence card and an accepted payment method — so it isn't something you can use on landing day.

There are also carriers aimed at foreigners (Sakura Mobile, Mobal) that trim the paperwork, but their data plans stay expensive per gigabyte and involve postal delivery or an airport pickup. To bridge precisely the gap between arrival and your permanent line, the eSIM is the fastest and least binding route.

The PlanJapan eSIM: your bridge solution for the first months

An eSIM is a virtual SIM card you install by QR code, with no physical chip and no store visit. The PlanJapan eSIM is a data-only plan running on the NTT Docomo network. In practice, you buy it online before you leave, scan the QR code to install it, and it switches to the Japanese network the moment you land at Narita or Haneda — by the time you reach baggage claim, Google Maps already works.

One thing to understand from the start: PlanJapan does not provide a Japanese phone number and does not handle calls or SMS over the network. That's not a gap, it's a choice. Your calls and messages go through WhatsApp, iMessage, Signal or Telegram, using data and your personal number kept on your home line (a dual-SIM setup). We cover this in its own section below.

The other big win for a relocation is tethering. Hotspot is available with no dedicated cap: from your phone you connect your laptop for remote work, your tablet, or your partner's phone until they get their own solution. That's a real edge over rival plans that throttle or cap sharing.

On activation windows, standard data plans can be installed and activated freely for 180 days after purchase, and unlimited plans for 30 days. So you can buy your eSIM before departure without fear of "wasting" it: the validity period only starts on activation. To go deeper on the long-stay format, read our guide to the eSIM subscription for long stays.

The 50 GB/month plan: the ideal format for settling in

For most expats early in their move, the best choice is neither the 30-day data plan nor the 10-to-30-day unlimited plan, but the monthly subscription: $34.99 per month for 50 GB of data, renewing automatically each month unless you cancel. The logic is simple: when you arrive to settle in, you don't yet know exactly when your Japanese line will be ready. A fixed-duration plan forces you to recalculate and rebuy constantly.

The subscription removes that headache. You're connected from the first day of the transition to the last, you pay a predictable amount, and you cancel the month your contract with Docomo, au or Rakuten Mobile goes live. No manual monthly rebuying, no gap between two plans while you hunt for an apartment in Tokyo, Osaka or Fukuoka.

Fifty gigabytes a month is comfortable for a real relocation workload: daily Google Maps, banking and admin apps, WhatsApp video calls with family back home, apartment hunting on rental portals, and some remote work over hotspot. For very heavy video or constant 4K streaming, unlimited is a better fit — but for a typical move, 50 GB covers the month with room to spare.

If your stay has a well-defined length (a study semester, a three-month assignment), compare it with the digital nomad plans over 30, 60 and 90 days. And if you're on a working holiday, our guide to phone and internet on a working holiday covers the edge cases.

"During a move, the real constraint isn't the price per gigabyte — it's never ending up offline at the wrong moment."

Which plan to pick by length of your stay

Even for a relocation, a fixed-duration plan sometimes makes more sense than the subscription — for example if you already know the exact date you'll switch to a Japanese line. Here are the PlanJapan recommendations by duration and usage, to adapt to your situation.

The logic: under ten days, a standard data plan is enough and costs less. Beyond that, or the moment the duration gets blurry, 50 GB — as a 30-day plan or a monthly subscription — becomes the best peace-of-mind-to-price ratio. Unlimited is for those who refuse to watch their usage: daily streaming, continuous hotspot for remote work, or heavy video.

One concrete piece of advice: don't undersize your plan "to save money" during a move. The first weeks are actually the most data-hungry, between constant navigation in an unfamiliar city, translation and video calls. To fine-tune your estimate, our guide on how many GB to plan for Japan gives benchmarks by usage type.

Keeping your number and your accounts during the transition

This is the question that worries newcomers most: "if I switch to a data eSIM, do I lose my number and my texts?" The answer is no, as long as you understand how dual-SIM works. Your phone keeps your original SIM or eSIM active for voice and SMS, and adds the PlanJapan eSIM alongside it for data in Japan.

In practice, you set the PlanJapan eSIM as the default data line while leaving your home line active to receive SMS. WhatsApp, iMessage, Signal and Telegram keep working with your usual number, riding on the eSIM's data. So you stay reachable exactly as before, with no roaming bill.

This matters enormously during a move, because many errands trigger an SMS verification. Your home bank, your authenticator app, a government service: they still send 3D Secure codes or validation texts to your original number. By keeping that line active for reception, you receive those codes normally. For the step-by-step method, read our guide on keeping your phone number with an eSIM.

Watch the cost, though: leaving your home line active can trigger roaming charges if you use it for data. The right setup is to turn off data on the home line and keep only call and SMS reception. That way only data goes through the Japanese eSIM, and your home bill stays flat.

From the airport to your permanent Japanese line: the steps

Here's the concrete sequence of a smooth relocation on the connectivity side, from prep at home to switching onto a Japanese carrier. Each step maps to a specific moment of your move.

This progression has a psychological benefit: it removes all urgency. You're never forced to sign a poorly understood Japanese contract (often in Japanese) just because you need internet right now. You choose your permanent carrier when you're ready, comparing calmly. For that comparison, our comparison of Japanese mobile operators breaks down coverage, networks and positioning across Docomo, au, SoftBank and Rakuten Mobile.

One last data point: in Tokyo and Osaka, Docomo's 4G/5G network frequently tops 70 Mbps downstream, plenty for video-conferencing remote work during your move. Coverage stays solid even on the Shinkansen between major cities, which matters if your new role involves travel. To check the official coverage zones, see the NTT Docomo coverage map.

FAQ — Internet and moving to Japan

Can I get internet in Japan without a residence card?

Yes. A data eSIM like PlanJapan's needs no residence card, no Japanese bank account and no registered address. You buy it online and activate it yourself. It's the fastest way to stay connected before you have the documents needed for a local contract.

Is the PlanJapan monthly subscription right for an expat move?

Yes, it's the ideal use case. At $34.99/month for 50 GB, it renews automatically and cancels whenever you want. You stay connected without interruption through the whole transition, then stop the month your Japanese line goes live.

Will I lose my home number by using a Japanese eSIM?

No. In a dual-SIM setup, your home line stays active for calls and SMS, while the PlanJapan eSIM handles data only. WhatsApp, iMessage and your bank SMS codes keep arriving on your usual number.

How long does it take to get a real Japanese plan?

Usually three to eight weeks, the time to register your address at the ward office and open a Japanese bank account. Some banks even require six months of residency. The eSIM covers exactly that waiting period.

Can I share my connection with my partner during the move?

Yes. Hotspot is available with no dedicated cap on most phones. A single subscription can cover a laptop for remote work and a second phone until each person gets their own solution.

When should I buy and activate my eSIM before moving to Japan?

Buy it in the days before departure. Data plans can be activated up to 180 days after purchase and unlimited plans up to 30 days, so installing it early "uses up" nothing. The validity period starts only on activation, ideally on landing.