Quick Answer: Japan's mobile market has three tiers: MNOs (docomo, au/KDDI, SoftBank) with full service at premium prices, their sub-brands (ahamo, povo, LINEMO) offering strong networks at mid-range prices, and MVNOs (IIJmio, mineo, GTN Mobile) providing budget options. Since the 2020 government pricing reform, 20GB plans typically cost around ¥2,700-2,970 — roughly 40% less than before.
The Three Pillars: Japan's MNOs
Japan's mobile infrastructure is built and operated by three Mobile Network Operators (MNOs). Each owns its own cell towers, spectrum licenses, and nationwide backbone:
- NTT docomo — Approximately 36% market share. Generally regarded as having the broadest coverage, particularly in rural and mountainous areas. The legacy carrier of Japan's telecom industry.
- au / KDDI — Approximately 27% market share. Strong coverage in mountainous regions and suburban areas. Known for innovative plan structures.
- SoftBank — Approximately 21% market share. Tends to be strongest in urban areas. Parent company of Yahoo! Japan and PayPay, enabling bundled services.
- Rakuten Mobile — Approximately 8% market share. Japan's newest MNO (launched 2020), still expanding its own network. Uses au's network as a roaming partner in areas not yet covered.
The Sub-Brand Revolution
In 2020, then-PM Suga Yoshihide publicly criticized Japan's high mobile prices. The government pushed carriers to lower costs, and each MNO responded by launching online-only sub-brands:
- ahamo (docomo) — 20GB ¥2,970/month. Uses docomo's full network.
- povo 2.0 (au/KDDI) — Base ¥0/month with data "toppings." Uses au's full network.
- LINEMO (SoftBank) — 3GB ¥990 or 20GB ¥2,728/month. Uses SoftBank's full network.
Sub-brands run on the exact same network as their parent MNO, so coverage and speed are generally identical. The trade-off: no physical store support and limited customer service channels.
MVNOs: The Budget Tier
Mobile Virtual Network Operators (MVNOs) lease network capacity from MNOs. They don't own infrastructure, which keeps prices low but can mean slower speeds during congestion (typically 12:00-13:00 and 18:00-19:00).
Popular MVNOs include IIJmio, mineo, GTN Mobile (foreigner-focused), and OCN Mobile ONE. Some MVNOs offer multilingual support, making them accessible to non-Japanese speakers.
Comparison: MNO vs Sub-Brand vs MVNO
| Feature | MNO (docomo/au/SoftBank) | Sub-Brand (ahamo/povo/LINEMO) | MVNO (IIJmio/mineo/GTN) |
|---|---|---|---|
| Monthly Price (20GB) | ¥5,000–7,500 | ¥2,700–2,970 | ¥1,800–2,200 |
| Network Speed | Fastest (priority) | Same as MNO | Slower at peak hours |
| Coverage | Full nationwide | Same as parent MNO | Depends on leased network |
| Physical Stores | Yes (nationwide) | No (online only) | Limited or none |
| English Support | In major city stores | Limited | Varies (GTN: multilingual) |
| Contract Period | None (since 2022) | None | None (typically) |
Why Prices Dropped in 2020-2021
Before 2020, a typical 20GB plan cost ¥6,000-8,000/month. The Suga administration publicly pressured carriers, arguing Japan's mobile costs were among the highest in the OECD. The result: sub-brands launched, MVNOs gained subscribers, and even the main brands reduced prices. Today, foreign residents benefit from this competition — quality plans are available at a fraction of the old price.
Q: Do I need to sign up with an MNO, or is a sub-brand/MVNO fine?
For most foreign residents, a sub-brand (ahamo, povo, LINEMO) offers the best balance of network quality and price. Consider an MNO only if you need in-store support in Japanese, or an MVNO if budget is the top priority.
Q: Are there still contract cancellation fees in Japan?
No. As of 2022, the government prohibited contract cancellation fees (解約金). You can switch carriers at any time without penalty.
Q: Can I use my current phone number when switching carriers?
Yes. Mobile Number Portability (MNP) allows you to keep your number. The transfer fee was abolished in 2021, so it is now free. See our MNP guide for details.
Disclaimer: Information is based on publicly available data as of early 2026. Market share figures are approximate. Plans and pricing may change without notice. Please verify current details on each carrier's official website before making a decision.
