For foreigners who have just arrived in Japan, setting up an internet connection and mobile phone contract can be a significant challenge at first. In this article, we explain in detail the types of contracts, necessary documents, and recommended services. We walk you through each step so you can confidently set up your connectivity right after arriving in Japan.
Reviewed by: Nobuyuki MoriPresident, M-Assets Co., Ltd. / Licensed Real Estate Transaction Specialist (Miyagi #018212)
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While setting up telecommunications contracts in Japan may seem difficult for foreigners, it's straightforward once you know the proper steps. In this article, we explain mobile phone (SIM) contracts and home internet contracts separately. Starting with a mobile phone contract first will help you get settled into your new life more smoothly.
There are two main types of mobile phone services in Japan.
Major carriers (MNOs) are NTT Docomo, au (KDDI), SoftBank, and Rakuten Mobile. They offer high-quality connections and reliable coverage nationwide. However, their monthly fees are somewhat higher, and support for foreigners varies by location.
Budget-friendly SIM cards (MVNOs) are companies that lease networks from major carriers to provide service. Companies like IIJmio and mineo are examples, and their monthly costs are often less than half those of major carriers, making them ideal for budget-conscious users. Connection speeds may be somewhat slower during peak hours.
If you need language support right after arriving, it's reassuring to choose a budget SIM company that offers multilingual assistance. IIJmio and Rakuten Mobile have relatively good English support.
You'll need the following documents to sign up for a mobile phone contract:
Your Residence Card is essential. It's issued after you register at your local municipal office following your arrival. Make sure the address on your Residence Card matches the address you provide when applying.
Your passport may also be required as additional identification.
For payment, you'll need either a credit card or a Japanese bank account set up for automatic transfer. Since some companies don't accept foreign-issued credit cards, it's best to open a Japanese bank account first or prepare a credit card that works in Japan.
You'll also need an email address for application and communication purposes. A free email service like Gmail or Yahoo Mail is fine.
If your Residence Card address hasn't been registered shortly after arrival, some services may not allow you to contract. First, complete your registration at your local municipal office before proceeding with the contract.
Life without internet while waiting to complete your registration and open a bank account can be very inconvenient. For this reason, we recommend using a prepaid SIM card or eSIM right after arriving.
Prepaid SIM cards can be purchased at convenience stores and airports. Examples include B-Mobile Tourist SIM and IIJmio Tourist SIM—they require no contract and you can start using them right away. They come with a set amount of data and an expiration date; when they expire, you can buy a new one or switch to a regular contract.
eSIM cards are physical card-free and can be installed directly from your smartphone's settings. If you purchase an international eSIM service like Airaio or Holafly before you depart, you can use it right after arriving in Japan. However, compatibility is limited to certain devices, so check beforehand.
After moving into a rental property, you'll need to set up a home internet connection. There are two main types: fiber optic lines and home routers (stationary Wi-Fi devices).
Fiber optic services include NTT Flets Hikari, au Hikari, and SoftBank Hikari. They offer fast, stable connections perfect for remote work and streaming video. However, they require installation work and can take 2 to 4 weeks from application to activation. Also, some rental properties don't allow installation, so you'll need to check with your landlord or building management.
Most plans have contract terms of 2 to 3 years, and early termination fees apply if you cancel. This option is ideal for those planning a longer stay in Japan.
Home routers include SoftBank Air, Docomo Home 5G, and au HOME 5G. They simply plug into an outlet, so no installation is needed and you can use them immediately. While speeds may be slower than fiber optic lines, they're usually adequate for everyday use. This option works well for those who move frequently or are staying for a shorter period.
Here are common challenges that foreigners face when setting up telecom contracts:
Contract documents are often in Japanese only. While some major carrier stores have English-speaking staff, not all do. Online applications are convenient for budget SIMs because you can go at your own pace and use a translator.
Timing of address verification also requires attention. If the address on your Residence Card doesn't match the address on your application, you may not pass the review. After moving, update both your residential registration and your Residence Card address as soon as possible.
You may be rejected during credit card approval. Right after arriving in Japan, you have no credit history here, which can make approval difficult. Choose a service that accepts debit cards or automatic bank transfers, or use a prepaid SIM while you set up a Japanese bank account and credit card.
Also check the cancellation process before signing up. Procedures can be complicated when you return to your home country or move. Always confirm the cancellation method and any early termination fees before contracting.
To set up your connectivity after arriving in Japan without confusion, follow these steps:
Step 1: Right after arriving, purchase a prepaid SIM or eSIM so you can use the internet on your mobile phone immediately.
Step 2: Register at your local municipal office and have your address added to your Residence Card.
Step 3: Open a Japanese bank account (you'll need your residential registration certificate).
Step 4: Sign up for an official mobile phone contract with a budget SIM or major carrier.
Step 5: Apply for a fiber optic line or home router depending on your housing situation.
Once your connectivity is set up, you'll be able to handle most aspects of daily life through your smartphone or computer. It might feel overwhelming at first, but if you take it one step at a time, you'll definitely get through it. If you have questions, make full use of consultation services for foreigners, such as international exchange associations at your local municipal office.
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