📱 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

The three major carriers — NTT docomo (widest coverage area), au/KDDI (strong nationwide coverage), and SoftBank (strong in urban areas) — own the physical network infrastructure. Rakuten Mobile is a newer fourth player with competitive pricing. These carriers operate physical shops where you can get in-person assistance, and their plans typically cost 3,000 to 7,000 yen per month.

Budget MVNOs (Mobile Virtual Network Operators) rent space on those same networks but offer much cheaper plans. Popular options for foreign residents include LINEMO (from 990 yen/month), GTN Mobile (with multilingual support in Vietnamese, Chinese, and English), ahamo (2,970 yen for 20GB), and povo (pay-as-you-go data). MVNO plans typically cost 990 to 3,000 yen per month and handle everything online.

For most foreign residents, starting with an MVNO is the practical choice. The monthly savings add up quickly. 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. There are four main options:

• Physical SIM — the traditional card that you insert into your phone. Good if you want to swap SIMs between devices.
• eSIM — a digital SIM activated remotely on newer phones. This is the fastest option since it can be activated within hours without waiting for a physical card in the mail.
• Data-Only SIM — for tablets or secondary devices. Provides internet access but no phone number.
• Voice + Data SIM — the standard service that includes a phone number and internet access. This is what most people need.

Most modern smartphones support both physical SIM and eSIM, but it is worth confirming your device's compatibility before you apply.

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

Bring the following when signing up for a SIM card:

• Residence Card (zairyu card) — this is your primary form of ID. Make sure the address on the back is current — carriers will reject applications if the address does not match their verification records.
• Passport — for additional identity verification, especially for new arrivals
• Payment method — a Japanese credit or debit card, or a Japanese bank account for automatic deductions. This is often the biggest hurdle for new arrivals.
• My Number Card — some carriers require this for identity verification, though not all do

If you have just moved, visit your local city hall to update the address on your residence card before applying for a SIM card.

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. If you do not have a Japanese bank account yet, GTN Mobile accepts overseas credit cards. If your remaining visa period is short, budget carriers tend to be more flexible — 3 or more months is often enough. If you do not have a credit card at all, many carriers accept bank auto-debit or convenience store payment.

Identity Verification Process

Most carriers now use an online identity verification process called eKYC. First, you upload front and back photos of your residence card. Then you may need to upload a secondary ID document such as your passport. Some carriers also require a selfie for facial recognition matching. The whole process takes 1 to 3 business days for online applications.

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.

Sign-Up Channels

In-store sign-up is best if you prefer face-to-face assistance. You can visit a carrier's dedicated shop (like a docomo shop or SoftBank store), test phones before buying, and walk out with an activated SIM the same day. The downside is that you may need a reservation, and staff at smaller shops may not speak English.

Online sign-up is almost always the better deal — many carriers offer web-exclusive discounts and waive setup fees for online applications. Several carriers have English-language websites. If you choose eSIM, you can be activated within hours. For a physical SIM, delivery takes 3 to 5 days by mail.

Electronics stores like Yodobashi Camera, BIC Camera, and Yamada Denki are a great middle ground. These large stores house multiple carrier counters under one roof, so you can compare options in person and sign up on the spot. Staff at stores in major cities are more likely to speak English.

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. Prepaid SIM cards are available at airports and convenience stores (data only, lasting 7 to 30 days). Pocket WiFi rentals are available at airport counters and provide WiFi for multiple devices. You can also purchase a tourist eSIM before arrival for instant data when you land.

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.

Plan Comparison Factors

Budget MVNOs typically cost 990 to 3,000 yen per month and offer 3 to 20 GB of data. Coverage is good in urban areas, and some like GTN Mobile offer support in Vietnamese, Chinese, and English. Contracts often have no minimum period, so you can cancel anytime.

Major carriers cost 3,000 to 7,000 yen per month but offer 20 GB to unlimited data with the best nationwide and rural coverage. Language support varies by location, and some plans still have 2-year contract terms.

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 practical recommendations based on common profiles among foreign residents:

• Students and budget-conscious users — GTN Mobile or Rakuten Mobile offer multilingual support and the lowest costs
• Working professionals — ahamo (2,970 yen for 20GB) or LINEMO (from 990 yen) provide a good balance of price and data
• Rural area residents — NTT docomo or au have the best coverage outside major cities
• International callers — Rakuten Mobile offers free international calls through the Rakuten Link app, which can save significant money if you call home frequently

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)

The process is straightforward. First, contact your current carrier and request an MNP reservation number (MNP yoyaku bangou). This number is valid for 15 days. Next, sign up with your new carrier and provide the MNP reservation number during the registration process. Once the new carrier processes the transfer, your old contract is automatically cancelled and your phone number moves to the new carrier.

The key thing to remember is that your MNP reservation number expires after 15 days, so complete your new carrier sign-up promptly. 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. Contact your carrier's cancellation line or visit a shop. Check for any early termination fees (though most plans no longer have them), return any rented equipment such as a WiFi router, and confirm the final billing amount.

Important — before leaving Japan: Cancel your mobile contract before departure. Unpaid bills can cause serious issues if you return to Japan, as carriers share information about delinquent accounts. Even if you plan to come back someday, outstanding debts may prevent you from signing up for services in the future.