📱 Complete Guide to Getting a Mobile Phone & SIM Card in Japan

Getting a mobile phone is one of the first things most foreign residents need after arriving in Japan. The Japanese mobile market can feel overwhelming at first glance, but it is actually simpler than it looks. There are three major carriers that own the actual cellular networks, plus Rakuten Mobile as a newer fourth player, and dozens of smaller companies called MVNOs that rent space on those networks to offer cheaper plans.

Major Carriers vs. Budget MVNOs

Japan's mobile landscape is split between full-service carriers with physical shops and budget-friendly virtual operators that handle everything online. Here is how they compare at a glance:

For most foreign residents, starting with an MVNO is the practical choice. The monthly savings add up quickly — a typical MVNO plan costs 990-3,000 yen per month versus 3,000-7,000 yen on a major carrier. If you find coverage is insufficient in your area, switching carriers is free thanks to Japan's MNP (number portability) regulations.

SIM Types

Before signing up, you will need to decide which SIM format works for your device. Most modern smartphones support both physical SIM and eSIM, but it is worth confirming before you apply.

If you want the fastest setup, choose eSIM — it can be activated within hours without waiting for a physical card in the mail. However, if you plan to swap SIMs between devices often, a physical SIM gives you more flexibility.

Japanese carriers are required by law to verify your identity before activating a SIM card. This means you will need to have certain documents ready before you start the sign-up process. The good news is that the requirements are fairly standardized across carriers, so once you have gathered these documents, you can apply almost anywhere.

Standard Requirements

Make sure your residence card has your current address registered on the back. If you have just moved, visit your local city hall to update the address first — carriers will reject applications where the address does not match their verification records.

Special Cases

Not everyone arrives in Japan with a full set of documents ready. If you are a new arrival still setting up your life here, these workarounds can help you get connected sooner:

Identity Verification Process

Most carriers now use an online identity verification process called eKYC. This typically involves uploading photos of your documents and a selfie. Here is the step-by-step flow you can expect:

If your verification is rejected, the most common reason is blurry document photos or a mismatch between the name on your residence card and the name you entered. Double-check your romanized name spelling and try again with clearer photos taken in good lighting.

Once you have decided on a carrier and gathered your documents, the next step is choosing how to sign up. Japan offers three main channels, each with its own advantages. Your choice will depend on how comfortable you are with Japanese, whether you need same-day activation, and how much you value getting a deal.

If you are comfortable navigating websites in English or Japanese, online sign-up is almost always the better deal — many carriers offer web-exclusive discounts and waive setup fees for online applications. For those who want hands-on help, electronics stores like Yodobashi Camera and BIC Camera are a great middle ground since they house multiple carrier counters under one roof.

For New Arrivals: Temporary Options

If you have just landed in Japan and need internet access right away — before you have a residence card or registered address — there are several short-term solutions available at airports and convenience stores:

Think of these temporary options as a bridge to get you through your first week or two. Once you have completed your resident registration at city hall and received your residence card with an address on the back, you can apply for a proper monthly plan with much better value.

Choosing between dozens of carriers and plans can feel like a chore, but the decision really comes down to a few key factors: how much data you use, where you live, and whether you need support in your language. The table below breaks down the most important differences between budget MVNOs and major carriers so you can make an informed choice.

Plan Comparison Factors

As a rule of thumb, if you live in a major city like Tokyo, Osaka, or Nagoya, an MVNO will give you perfectly fine coverage at a fraction of the cost. If you live in a rural area or travel frequently to the countryside, paying more for a major carrier's network may be worth the reliability.

Recommendations by Situation

Everyone's situation is different. Here are our top picks based on common profiles among foreign residents in Japan:

Remember, switching carriers in Japan is easy and free thanks to MNP regulations. So do not overthink your first choice — pick the plan that seems right for now, and you can always switch later if your needs change.

One of the best things about Japan's mobile market is that you are never locked into a carrier. Thanks to MNP (Mobile Number Portability) regulations, you can switch to any carrier while keeping your existing phone number. The entire process usually takes just one to two days, and there is no transfer fee.

MNP (Mobile Number Portability)

Here is the simple three-step process to transfer your number to a new carrier:

The key thing to remember is that your MNP reservation number expires after 15 days, so make sure to complete your new carrier sign-up promptly after requesting it. Most new carriers also require at least 7 days of validity remaining on the MNP number, so do not wait until the last minute.

Cancelling Without MNP

If you do not need to keep your number — for example, if you are leaving Japan — you can simply cancel your contract directly. Here is what to keep in mind:

• Contact your carrier's cancellation line or visit a shop
• Check for any early termination fees
• Return any rented equipment
• Confirm the final billing amount