What This Guide Covers
Choosing a mobile plan in Japan as a foreign resident isn’t just about price — it’s about finding a carrier that actually works for your situation. Can you sign up without a Japanese credit card? Is there English support? What happens when you travel home?
This guide compares the most popular mobile plan options available to foreigners in Japan in 2026, with honest pros and cons for each. No carrier is perfect, and the best choice depends on your specific needs.
Understanding Japan’s Mobile Market
Japan’s mobile landscape can be confusing, so here’s a quick orientation:
The Big Three
- docomo, au (KDDI), and SoftBank are Japan’s legacy carriers with the largest networks
- Premium plans are expensive (7,000-8,000+ yen/month for unlimited data)
- Best coverage, especially in rural areas
- In-store English support available at select locations in major cities
Budget Sub-Brands
- ahamo (docomo), povo (au), LINEMO (SoftBank) are online-only brands from the big three
- Cheaper prices, same parent network coverage
- Limited or no in-store support
- Mostly Japanese-only customer service
Rakuten Mobile
- Japan’s “fourth carrier” — built its own network from scratch starting in 2020
- Aggressive pricing with unlimited data at 3,278 yen/month
- English-language support via website and app
- Growing network coverage, with au/KDDI partner roaming filling gaps
MVNOs (格安SIM)
- Companies like IIJmio, mineo, OCN Mobile ONE that rent network capacity from the big three
- Very cheap (often under 1,000 yen/month for small data plans)
- Speeds can drop significantly during peak hours (lunch, evening commute)
- Almost entirely Japanese-only
- Generally not recommended for foreigners unless you’re comfortable with Japanese
Side-by-Side Comparison
Here’s how the main options stack up on the factors that matter most to foreign residents:
| Feature | Rakuten Mobile | ahamo | povo 2.0 | LINEMO | UQ Mobile | Y!Mobile |
|---|---|---|---|---|---|---|
| Network | Rakuten + au partner | docomo | au | SoftBank | au | SoftBank |
| Monthly price | 1,078-3,278 yen | 3,135-5,115 yen (from Dec 1, 2026) | 0-12,980 yen | 990-2,970 yen | 4,048 yen (from 1,628 yen with discounts) | 3,278-5,478 yen (before discounts) |
| Data | Unlimited (step pricing) | 40-120 GB (step pricing) | Pay-as-you-go | 3-30 GB | 30 GB | 5-35 GB |
| Unlimited data option | Yes (3,278 yen) | No (120 GB max) | 24h unlimited (330 yen/day) | No | No | No |
| Contract period | None | None | None | None | None | None |
| English website/app | Yes | Partial | No | No | No | No |
| Free overseas roaming | 2 GB/month free | 30 GB shared (40 GB from Dec 2026) | Requires add-on | Up to 7 days/month (eligible countries) | Not included | Not included |
| Free domestic calls | Yes (via Rakuten Link) | 5 min/call free | None (add-on available) | None (add-on available) | None (add-on available) | None (add-on available) |
| In-store signup | Yes | Online only | Online only | Online only | Yes | Yes |
| Debit card / bank payment | Yes | Yes (debit) | Yes (some) | Credit card mainly | Yes | Yes |
Prices are tax-included. Plans and pricing are as of June 2026 and subject to change.
Carrier Breakdown: Pros and Cons
Rakuten Mobile
Pros:
- Cheapest unlimited data at 3,278 yen/month — no other carrier comes close
- English website and app — rare among Japanese carriers at this price point
- Free domestic calls through Rakuten Link (no time limit)
- Free overseas roaming with 2 GB/month included — great for trips home. For details on how to make the most of this benefit, see 【2026年版】楽天モバイルの海外ローミング2GB無料を徹底解説｜賢く使うコツと節約術
- Flexible payment — accepts debit cards and bank accounts, not just credit cards
- Step pricing means you only pay for what you use (1,078 yen if you stay under 3 GB)
- Re-contracts and second lines are eligible for employee referral bonuses
Cons:
- Coverage in rural areas relies on partner networks (au roaming) — not as reliable as docomo’s native coverage
- Rakuten Link call quality can be inconsistent — it uses VoIP, so quality depends on your internet connection. Standard phone calls are fine but cost extra
- Indoor coverage in some older concrete buildings can be weak, though this has improved significantly since 2024
- Rakuten is newer — the network is still maturing compared to carriers with 30+ years of infrastructure
- Points are limited-time — referral bonus points expire 6 months after being granted
ahamo (docomo)
Pros:
- docomo’s network — the gold standard for coverage in Japan, including rural and mountainous areas
- From December 1, 2026, tiered pricing: 3,135 yen up to 40 GB, 4,125 yen up to 60 GB, 5,115 yen up to 120 GB (until November 30: 30 GB for 2,970 yen)
- 5-minute free calls included (no app needed)
- Overseas data included (up to 40 GB from December 2026)
Cons:
- No unlimited data option (120 GB is the maximum; the 110 GB “Oomori” add-on ends on November 30, 2026)
- Online-only — no in-store support
- Limited English support (some documentation available, but customer service is Japanese)
- No debit card payment (credit card required for most applicants)
- If you use more than 40 GB, Rakuten Mobile’s unlimited plan is 847-1,837 yen/month cheaper
For a detailed head-to-head breakdown of these two carriers, 【2026年12月改定対応】ahamo vs 楽天モバイル 徹底比較｜段階制の新料金でどちらがお得か判定も参考にしてみてください。
povo 2.0 (au)
Pros:
- Base plan is literally 0 yen/month — you only pay for data “toppings” when you need them
- Uses au’s reliable network
- Great flexibility for very light or inconsistent data users
Cons:
- Can get expensive if you use it regularly — 30-day 20 GB topping costs 2,700 yen
- Entirely in Japanese — website, app, and support
- No free calls included
- Online-only, no stores
- Account is automatically cancelled if you don’t make a purchase for 180 days
LINEMO (SoftBank)
Pros:
- Mini plan (3 GB) at 990 yen is one of the cheapest options
- SoftBank’s established network
- LINE app data doesn’t count toward your data cap
Cons:
- Maximum plan is only 30 GB (2,970 yen) — no unlimited option
- Japanese only — no English support
- Online-only, no stores
- No free calling included
UQ Mobile (au)
Pros:
- Uses au’s full network (not a sub-brand that throttles speeds)
- Physical stores available for in-person support
- Reasonable pricing with multiple plan options
Cons:
- No unlimited data option
- No English support
- Pricing can be confusing with various discount conditions
- Overseas roaming requires separate application and fees
Y!Mobile (SoftBank)
Pros:
- SoftBank’s full network
- Extensive store network — easy to find a shop for help
- Family discounts available
Cons:
- More expensive than competitors for similar data amounts
- No unlimited data
- No English support
- Plans can be confusing with conditional discounts
When Rakuten Mobile Is NOT the Best Choice
Being honest: Rakuten Mobile isn’t perfect for everyone. Consider alternatives if:
- You live in a very rural area and need the most reliable possible coverage — ahamo (docomo network) is the safer bet. Rakuten’s own network coverage, while expanding, is still thinnest in remote and mountainous regions.
- You make important phone calls (business calls, interviews) and can’t tolerate any voice quality issues — standard cellular calls on docomo/au/SoftBank networks are more consistently clear than Rakuten Link’s VoIP calls.
- You use very little data (under 3 GB) and want the absolute lowest price — LINEMO’s mini plan at 990 yen or povo’s pay-as-you-go model may cost less.
- You’re only in Japan for a few weeks — short-term visitors are better served by prepaid tourist SIMs available at airports. Rakuten Mobile is designed for residents.
When Rakuten Mobile IS the Best Choice
Rakuten Mobile shines if:
- You use a lot of data — unlimited data at 3,278 yen is unmatched. The next closest (ahamo) will cost 3,135 yen for 40 GB, 4,125 yen for 60 GB, and 5,115 yen for 120 GB from December 1, 2026.
- You want English support — Rakuten Mobile is one of the few budget carriers with a genuinely usable English interface.
- You travel internationally — free 2 GB/month overseas roaming is included at no extra charge. Most other carriers either don’t include it or share your domestic data allowance.
- You call a lot domestically — Rakuten Link provides completely free domestic calls with no time limit. Other carriers charge per minute or limit free calls to 5 minutes. For a full guide on how to use the app effectively, see Rakuten Linkアプリの使い方・無料通話を徹底活用する術｜楽天モバイルをもっとお得に使う方法
- You don’t have a Japanese credit card — Rakuten Mobile accepts debit cards and bank accounts.
- You value simplicity — one plan, automatic step pricing, no confusing discount conditions.
The Employee Referral Bonus: An Extra 1,000 Points
If you’ve decided Rakuten Mobile is right for you, there’s one more thing worth knowing. By applying through an employee referral link instead of going directly to the website, you receive extra bonus points:
| How You Apply | MNP (Number Transfer) | New Signup |
|---|---|---|
| Regular campaign | 13,000 pt | 12,000 pt |
| Employee referral | 14,000 pt | 13,000 pt |
| Difference | +1,000 pt | +1,000 pt |
The process is the same either way — you just start from the referral link instead of the main Rakuten Mobile page. After applying, make a 10-second call using the Rakuten Link app (required for applications from March 2, 2026) and the points are automatically applied to your account.
Points are paid in 3 installments starting 4 months after your signup month. They’re limited-time Rakuten Points, valid for 6 months — usable at Rakuten Ichiba, Rakuten Pay (accepted at most convenience stores and many shops), and other Rakuten services. For ideas on how to spend these points effectively, 楽天ポイント14000の使い道｜お得な活用法と賢い貯め方を徹底解説も参考にしてみてください。
Tip: Rakuten Mobile’s website and app support multiple languages. After signing up, you can change the display language to English in your account settings.
How to Get Started
If Rakuten Mobile looks like the right fit, here’s the short version:
- Prepare your Residence Card, My Number Card, and a payment method (credit card, debit card, or bank account)
- Click the employee referral link below and log in with your Rakuten ID
- Choose your plan and SIM type (eSIM for instant activation)
- Upload your ID documents and complete the application
- After activation, download Rakuten Link and make a 10-second call
- Receive up to 14,000 bonus points over the following months
The entire process takes about 15-20 minutes online.