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How to Get a SIM Card and Internet in Japan

How to Get a SIM Card and Internet in Japan

Staying connected in Japan is essential, but navigating phone and internet options can be confusing for newcomers and fairly different from other countries. Unlike prepaid tourist plans, long-term residents must go through a formal registration process, often in Japanese. This guide explains the easiest ways to get a SIM card, eSIM, or home internet plan in Japan—especially for professionals, families, and students staying over one year.

1) Understanding the SIM Card System

To use a mobile plan in Japan, you’ll need a Japanese phone number registered under your name. Most carriers require proof of residence and a valid visa with at least three months’ remaining validity. Foreign residents can choose between two main options:

  • Major carriers: SoftBank, NTT Docomo, and au by KDDI. Reliable but contracts are often 2 years and in Japanese.
  • MVNOs (low-cost carriers): Services like Sakura Mobile, Mobal, and IIJmio offer simpler signups and English support.

Postpaid plans usually require a local bank account or credit card for monthly billing. Prepaid options exist, but they’re limited and often not ideal for long-term use.

2) eSIMs — A Convenient Alternative

eSIMs are gaining popularity in Japan. They’re fully digital, activated via QR code, and ideal for those already using an unlocked phone. Many carriers now offer hybrid support: a physical SIM for calls and an eSIM for data.

  • Setup time: Often same-day; no need to visit a store.
  • English support: Available through providers like Mobal, Sakura Mobile, or Airalo (for arrivals).
  • Flexibility: You can switch carriers easily without replacing hardware.

For long-term residents, confirm the eSIM supports Japanese phone numbers and not only data connectivity. Data-only eSIMs are common among travel users and might not suit work or residency needs.

3) Internet at Home — Fiber and Pocket Wi-Fi

Once settled, you’ll likely want home broadband. The most common connections are fiber optic (Hikari) and mobile Wi-Fi routers:

  • Fiber (Hikari): Fast, stable, and best for streaming or remote work. Popular options include NURO Hikari, SoftBank Hikari, and Rakuten Hikari.
  • Pocket Wi-Fi: Portable, contract-free devices—ideal for temporary housing or short stays before a fiber setup.

Fiber installation can take 1–3 weeks, depending on building type and provider. Check if your apartment building already supports fiber lines before signing a lease—it can save both time and money.

4) Comparison: SIM, eSIM, and Home Internet

Type Setup Time Visa Requirement Main Advantage Best For
Physical SIM (postpaid) 1–5 days Required (3+ months) Stable, full service with phone number Long-term residents, workers
eSIM Instant to 24 hrs Sometimes waived Quick setup, flexible plans Frequent travelers, dual users
Home Fiber (Hikari) 1–3 weeks Required (residence card) Fastest, most stable option Remote workers, families
Pocket Wi-Fi Same-day Not always required Portable, no installation Short-term users, temporary housing

5) Documents You’ll Need

  • Residence card (在留カード)
  • Passport (for identification)
  • Japanese address (officially registered)
  • Phone number (temporary OK for registration)
  • Bank account or Japanese credit card (for billing)
  • My Number (マイナンバー) – required by many major carriers

6) Common Mistakes to Avoid

  • Signing long contracts too early: Avoid two-year plans until you know your area’s signal quality.
  • Forgetting cancellation fees: Many Japanese plans auto-renew with exit penalties after the first year.
  • Assuming English support everywhere: Choose providers known for multilingual assistance if you’re not fluent.
  • Overlooking installation timelines: Home fiber can take weeks—use pocket Wi-Fi in the meantime.

Related Reading

Still choosing where to settle in Tokyo? Explore our overview of the most international and convenient neighborhoods: Best Places to Live in Tokyo for Expats (2025).

Disclosure: This content is for informational purposes only and may contain future affiliate links. Terms and availability vary by carrier and location. Always confirm contract terms before signing.

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