SoftBank Data SIM Cards Japan

Stay connected on one of Japan's top networks with our SoftBank Data SIMs. Perfect for expats, students, and travelers, these SIM cards offer flexible, high-performance internet access without the hassle of long-term commitments.

Key Benefits:

  • High-Speed Coverage: Experience fast and reliable 4G LTE and 5G networks nationwide.
  • No Long-Term Contracts: Enjoy budget-friendly data plans with zero cancellation fees.
  • SMS Support: Easily receive SMS messages to register for Japanese banking apps, Uber Eats, and other essential services.

Explore our SoftBank data plans below and choose the perfect fit for your data needs.

SoftBank Data SIM Cards Japan

Data SIM — Frequently Asked Questions

Everything you need to know about SoftBank Data SIM cards for Japan.

Why do all plans show the same ¥5,500 initial price?

¥5,500 = activation fee + first month. Same for all plans. The monthly fee after that differs: 35GB = ¥2,150, 50GB = ¥2,330, 100GB = ¥2,750. Check each product page for details.

How do I pay monthly fees?

We send payment instructions via email. Pay through Messenger, WhatsApp, or monthly email link. We accept cards, bank transfer, SmartPit, PayPay, LINE Pay.

How long does delivery take?

1–3 business days via Japan Post or Yamato. Free shipping. Tracking number provided.

Does my phone need to be unlocked?

Yes. Phone must be SIM-free (unlocked). Phones bought from Apple, Samsung, or Google directly are usually unlocked.

Can I make phone calls?

No. Data SIM is data-only. Use WhatsApp, LINE, Skype for calls. For a phone number, see Docomo Voice SIM.

What happens when I run out of data?

Speed reduced to 128–200kbps until next billing cycle. Still works for messaging, maps, email — just slower for streaming.

Can I use the SIM in a WiFi router?

Yes. Works in unlocked Pocket WiFi routers and mobile hotspots that support SoftBank bands (Band 1, 3, 8, 41).

Monthly vs Yearly — what's the difference?

Monthly: initial fee + monthly fee, cancel anytime. Yearly: one-time payment for 12 months, no recurring billing. Yearly is cheaper per month but less flexible.

Can I change my plan later?

Yes. Contact support to upgrade or downgrade. Changes apply next billing cycle. Same SIM card — no replacement needed.

How do I set up APN?

Instructions included with SIM. Also see our APN Settings Guide. Takes 2 minutes.

Can I cancel anytime?

Yes. Notify before billing date (20th–25th). No cancellation fee. Initial fee non-refundable.