Data-only SIM or a callable phone number: what you need to open a bank account in Japan

You have just moved to Japan, your phone works on a cheap data plan, and now the bank form asks for a phone number. It is a very common moment of panic for newcomers, and it raises a fair question: is a data-only SIM enough, or do you really need a number people can call? This guide explains the difference and helps you pick the right plan before you sit down at the bank counter.

Why the bank cares about your phone number

In Japan, a phone number is more than a way to chat. It is treated as part of your identity as a resident, alongside your residence card and your address. When you open a bank account, the bank wants a reliable way to reach you, and in practice that means a mobile number that can make and receive calls. Numbers starting with 090, 080 or 070 are the standard Japanese mobile numbers.

The same logic applies well beyond banking. A callable number is usually needed when you apply for jobs, sign a rental contract and register at many offices. So the question is not only about the bank. It is about whether you can complete the basic paperwork of settling in.

This is why many newcomers find that their first, data-only plan works perfectly for maps, messaging and video calls, but stalls the moment they try to do anything official. Knowing this early saves you a second trip to the bank.

What a data-only SIM can and cannot do

A data-only SIM gives you mobile internet and nothing else. It works with internet apps: messaging apps, email, maps, translation tools, streaming and app-based voice calls. For daily life in a new city, that covers a lot, and it is often the most affordable way to stay connected.

What it does not give you is a phone number. There is no SMS and no number that someone can dial. If a form asks for your mobile number, you have nothing to write in the box. App-based calling identities, such as your messaging account, are not accepted as a substitute for a Japanese mobile number on official forms.

A data-only plan is a sound choice for students who mainly need internet and do not yet have paperwork to handle. The shibaSIM Student plan is an example: 5GB of data, with no SMS and no phone number. It suits that situation well, but it is not the plan to rely on when you are about to open a bank account.

SMS without a callable number: the middle option

Some plans include SMS but still do not give you a number that can make or receive calls. The shibaSIM Work plan is one of these: 20GB of data with SMS, but no callable number. This sits between data-only and a full phone number.

SMS is useful for receiving verification codes from apps and services. Keep in mind that delivery of those codes depends on the app and the sender, so it is not guaranteed for every service. SMS is only available when a plan explicitly includes it, so check the plan details rather than assuming.

For banking, though, SMS alone usually is not the answer. The requirement that tends to matter is a number that can make and receive calls. If your main goal right now is opening a bank account, an SMS-only plan may still leave you one step short.

Plans with a real Japanese number

A plan with a callable number gives you a real Japanese mobile number starting with 090, 080 or 070. You can make and receive calls, receive SMS and write the number on any form without hesitation. The shibaSIM Japanese phone number plan includes 20GB of data, SMS and this kind of number.

If you are planning to open a bank account, rent an apartment or start a job soon, this is usually the plan that fits. It removes the most common blocker in the settling-in process. You can compare the options on the SIM and eSIM plans for residents page, where the current price is shown.

You do not need a Japanese credit card to sign up. Staff confirm a payment method that works for you in chat before you pay anything. Any minimum term or cancellation fee is also confirmed clearly before sign-up is finished, so nothing is hidden in fine print.

Tip: If you already have a Japanese number with another carrier and want to keep it, ask that carrier for an MNP transfer code first. Do not cancel your old contract before the transfer, or the number is lost.

The identity check before activation

Because a callable number is tied to your identity, these plans need verification before activation. Usually that means a valid residence card, your current address in Japan and a payment method in your own name. Staff explain every step before you send anything, so you know what is being asked and why.

Some providers require reading the IC chip on your residence card using your phone's NFC. If that applies to your plan, staff tell you in advance and guide you step by step. If your phone cannot read the chip, there is a fallback, so an older phone does not have to stop the process.

The practical point is that you need your residence card and a registered address before you can get a callable number. That shapes the order in which you do things, which is where many newcomers get stuck.

A sensible order for your first weeks

The paperwork in Japan can feel circular: the bank wants a phone number, the phone number wants an address, and you need to be online to sort it all out. Breaking it into steps makes it manageable.

If you have just arrived and do not have your residence card yet, a travel eSIM can cover the first days. It needs no documents, and it runs alongside your home SIM, so you keep your own number for messages from home. You can find one on the Japan travel eSIM page. It works on iPhone XR/XS and later and most higher-end Android phones from 2019. After payment you receive a QR code, normally within 30 minutes during support hours.

Once your residence card and address are ready, move to a monthly plan with a callable number. With that number active, go to the bank. Doing it in this order means you arrive at the counter with everything the form asks for, instead of being sent away to come back later.

Frequently asked questions

Can I open a Japanese bank account with a data-only SIM?

Usually not. A data-only SIM has no phone number, and a number that can make and receive calls (090, 080 or 070) is usually needed to open a Japanese bank account. A data-only plan is fine for internet, but plan to switch before your bank visit.

Is a plan with SMS enough for the bank?

SMS helps with app verification codes, but it is not the same as a callable number. If the plan has SMS but no number you can call from, it may not meet what the bank asks for. A plan with a real Japanese mobile number is the safer choice for banking.

Do I need a Japanese credit card to get a phone number plan?

No. A Japanese credit card is not required. Staff confirm a payment method that works for you in chat before you pay anything. For plans with a callable number, the payment method does need to be in your own name.

What if I arrived yesterday and have no residence card yet?

Use a travel eSIM for the first days. It needs no documents and keeps you online while you register your address and receive your card. Once those are ready, you can move to a monthly plan with a callable number and then open your bank account.

The takeaway

A data-only SIM keeps you connected, but it will not get you through bank paperwork in Japan. For that, you usually need a real 090, 080 or 070 number that can make and receive calls. If you are ready to settle in, have a look at the SIM and eSIM plans for people living in Japan and choose the one that fits your situation. If you are unsure which plan you need, real people answer in English from 8:00 to 22:00 JST by WhatsApp or at [email protected].