Getting a mobile phone and number as a resident in Japan is one of the first practical steps you’ll take after arriving — and it can feel surprisingly complicated. Unlike many countries where you can walk into a store and leave with a working SIM in 20 minutes, Japan has its own set of rules, documentation requirements, and carrier quirks that catch many newcomers off guard. The good news is that once you understand the system, the process is very manageable.
What You Need Before You Sign Up
Before visiting any carrier or store, make sure you have the right documents ready. Missing even one can mean a wasted trip. Most carriers require the same core set of documents regardless of which plan you choose.
Here’s what you’ll typically need:
– Residence card (在留カード, Zairyu Card) — this is your most important document and confirms your legal resident status in Japan
– Passport — required as a secondary ID by most carriers
– Japanese bank account or credit card — for monthly billing (cash payments are rarely accepted for postpaid contracts)
– My Number (マイナンバー) — increasingly required since 2024 for new SIM registrations under Japan’s updated telecommunications regulations
A common mistake is arriving at a softbank or au store with only a passport and cash. Without a residence card and payment method, you won’t be able to complete a postpaid contract. Set everything up first — including a bank account at Japan Post Bank (ゆうちょ銀行) or a major city bank — before you head to the store.
Choosing the Right Carrier: Major vs. Budget Options
Japan has two main tiers of mobile carriers: the big three (NTT Docomo, au by KDDI, and SoftBank) and a growing number of MVNOs (Mobile Virtual Network Operators) that offer cheaper plans on the same networks.
The big three offer the best coverage, bilingual customer support, and the widest selection of handsets. However, their plans typically start at around ¥2,970–¥4,950 per month for unlimited data. If you’re living in a major city and want peace of mind, these are a solid choice.
For budget-conscious residents, MVNOs like IIJmio, mineo, and Rakuten Mobile offer plans starting from as low as ¥850 per month. Rakuten Mobile in particular has been popular with foreigners for its straightforward pricing and English-language app. The tradeoff is that data speeds can slow down during peak hours, and in-store English support is limited.
For example, a new resident working in Tokyo might choose Rakuten Mobile’s one plan at ¥3,278/month for unlimited data — solid coverage in the city, a simple app in English, and no hidden fees.
Buying a Handset vs. Bringing Your Own
You have two options when it comes to the actual device: buy one in Japan or bring an unlocked phone from your home country.
Buying in Japan is convenient but expensive. A new iPhone 16 at a Docomo store starts at around ¥130,000–¥150,000, though installment plans can spread the cost over 24–36 months. Japanese carrier phones sometimes come locked to that network, so confirm before purchasing if you plan to travel internationally.
Bringing an unlocked phone from abroad is often the smarter move for residents. Most modern smartphones are compatible with Japanese LTE bands. Just check that your handset supports Band 3, Band 19, and Band 28 — the key frequencies used across Japanese networks. You can confirm this in your phone’s tech specs online before arrival.
Getting an eSIM as a Resident
Since 2023, eSIM adoption has grown rapidly in Japan, and most major carriers now support it. An eSIM lets you activate a Japanese number digitally without visiting a store in person — a huge convenience for new residents still getting settled.
Docomo, au, SoftBank, and Rakuten all support eSIM registration online. You’ll still need to submit your residence card details during the digital sign-up process. The whole activation can take as little as 30 minutes once your documents are ready.
FAQ
Can I get a Japanese phone number without a residence card?
For a standard postpaid contract, no. A residence card is required. However, if you’re waiting for your card to arrive, some MVNOs and prepaid SIM providers like IIJmio may accept a passport with a landing stamp as temporary verification for short-term solutions.
Can I keep my Japanese number if I switch carriers?
Yes. Japan supports MNP (Mobile Number Portability), which lets you transfer your existing number to a new carrier. The process typically takes 1–2 business days and can be initiated online or in-store. There is usually a small MNP transfer fee of around ¥3,300, though many carriers have eliminated this fee in recent years.
Is English support available at Japanese phone carrier stores?
It depends on the location. Stores in major cities like Tokyo’s Shinjuku or Osaka’s Namba tend to have English-speaking staff or tablet-based translation tools. For the most reliable English support, Rakuten Mobile’s online sign-up and SoftBank’s Shibuya flagship store are good starting points.
Conclusion
Getting a mobile phone and number as a resident in Japan is very achievable once you know what to prepare. Gather your residence card, passport, and payment method first — then decide between a major carrier for convenience or an MVNO for savings. Whether you buy a handset locally or bring your own unlocked device, you’ll be connected and set up faster than you’d expect.
Ready to take the next step? Check out our related guides on opening a Japanese bank account and setting up internet at home in Japan to get fully settled in your new life here.
