Quick Answer: This guide is for exchange students and working holiday makers staying in Japan for about 6–12 months. Start with an English-friendly provider for easy setup after arrival, then switch to a budget MVNO such as Rakuten Mobile or IIJmio via MNP once your address, payment method, and support network are in place. It covers initial signup, timing the switch, keeping your number, and sample cost comparisons.
Out of scope: Short tourist stays (→
tourist SIM guide
). One-year-plus residency and full MVNO comparisons (→
long-term resident SIM guide
). Campaign details (→
mobile cost-saving guide
).
Why do mid-term residents face a different mobile challenge?
Exchange students and working holiday visa holders typically stay around 6–12 months—longer than tourists, but not long enough to treat setup friction as a one-time cost you can ignore.
- Right after arrival: Your address, bank account, and Japanese may not be ready for standard MVNO signup
- During your stay: You want lower monthly fees, but still need flexible contracts and English support early on
- Uncertain end date: Easy cancellation matters if you leave Japan early
A practical approach is a two-phase strategy: start with a foreigner-friendly service, then move to a budget MVNO once you are settled. For why premium foreigner-focused services exist, see
Understanding foreigner-friendly mobile services in Japan
.
What should you choose for the first 1–3 months?
For your first 1–3 months, prioritize English support, residence-card-based signup, and flexible cancellation. The table below shows representative options. Tax-included figures are approximate as of writing and plans change.
- Best for
- Applying online before or right after arrival
- Approx. monthly fee (as of writing)
- Voice+Data 10GB from about ¥3,630/month
- Notes
- English support, no long-term lock-in, residence card accepted
- Best for
- Monthly plans with English customer service
- Approx. monthly fee (as of writing)
- Voice+Data 5GB from ¥3,278/month (tax incl.)
- Notes
- Docomo network, month-to-month options
| Example service | Best for | Approx. monthly fee (as of writing) | Notes |
|---|---|---|---|
| Mobal | Applying online before or right after arrival | Voice+Data 10GB from about ¥3,630/month | English support, no long-term lock-in, residence card accepted |
| Sakura Mobile | Monthly plans with English customer service | Voice+Data 5GB from ¥3,278/month (tax incl.) | Docomo network, month-to-month options |
📌 Upfront costs: Mobal charges a one-time SIM/eSIM fee (e.g. physical SIM ¥3,960). Sakura Mobile charges a ¥5,500 registration fee (tax incl.) in addition to monthly usage. Confirm current fees on each provider’s official site before applying.
If friends need short-term data only, point them to the
tourist SIM guide
. For your own mid-term stay, a voice number is usually more useful.
What do you need to sign up initially?
Even foreigner-friendly providers require identity verification. Commonly requested items include the following (additional documents may apply by provider or plan).
- Passport
- Residence card (issued at the airport on arrival)
- Credit card (some providers accept international cards)
- Email address
- Japanese address (some providers accept temporary or shared-house addresses)
📌 Photograph both sides of your residence card as soon as you receive it—you will use it repeatedly during settlement.
When should you switch to a budget MVNO?
A common target is 2–3 months after arrival. Consider switching when you have the following in place.
- A fixed address and working bank account or payment method
- Enough Japanese—or a friend—to follow online signup with translation tools
- A clearer picture of your data use (e.g. whether 10GB is enough or you need 20GB+)
Representative MVNO options (tax incl., as of writing)
Rakuten Mobile Saikyo plan (English website and app available)
- Monthly fee (tax incl.)
- ¥1,078
- Monthly fee (tax incl.)
- ¥2,178
- Monthly fee (tax incl.)
- ¥3,278
| Monthly data use | Monthly fee (tax incl.) |
|---|---|
| Up to 3GB | ¥1,078 |
| Up to 20GB | ¥2,178 |
| Over 20GB (high-speed unlimited area) | ¥3,278 |
IIJmio Giga plan (voice SIM standard monthly fees, approximate)
- Monthly fee (voice SIM guide)
- ¥1,400
- Monthly fee (voice SIM guide)
- ¥1,600
- Monthly fee (voice SIM guide)
- ¥2,000
| Data allowance | Monthly fee (voice SIM guide) |
|---|---|
| 10GB | ¥1,400 |
| 15GB | ¥1,600 |
| 25GB | ¥2,000 |
📌 Legacy copy such as “Rakuten ¥2,880 unlimited” or “IIJmio 20GB ¥2,178” does not match current official pricing. The table above reflects official fee schedules checked on August 23, 2026.
For one-year-plus residency and broader comparisons, see
Best mobile plans for long-term residents
. Market-wide contract entry points will also be covered in
mobile phone plans in Japan
(Wave 2).
How do you keep your number when switching?
In Japan, MNP (Mobile Number Portability) lets you change providers while keeping the same phone number in most cases.
- Request an MNP reservation number from your current provider
- Apply to the new provider and enter the MNP number during signup
- Complete activation following the new SIM/eSIM instructions
📌 An MNP reservation number is valid for 15 days under the system rules—confirm each provider’s wording before you apply. Avoid scheduling a switch during critical periods when losing your number would cause problems.
For campaign names and contract timing tactics, see the
mobile cost-saving guide
. This article does not treat seasonal campaigns as permanent savings.
How much can you save over a 10-month stay?
The table below is one example (based on official fees as of August 23, 2026; excludes upfront fees, call charges, tax nuances, and promotions).
- Breakdown
- Sakura Mobile Voice+Data 30GB (¥4,378/mo) × 10 months
- Approx. 10-month service fees
- ~¥43,780
- Breakdown
- Rakuten Mobile 20GB (¥2,178/mo) × 10 months
- Approx. 10-month service fees
- ~¥21,780
- Breakdown
- Sakura 5GB for 3 months (¥3,278×3) + Rakuten 20GB for 7 months (¥2,178×7)
- Approx. 10-month service fees
- ~¥25,080
| Pattern | Breakdown | Approx. 10-month service fees |
|---|---|---|
| A. Foreigner-friendly only | Sakura Mobile Voice+Data 30GB (¥4,378/mo) × 10 months | ~¥43,780 |
| B. MVNO only from arrival | Rakuten Mobile 20GB (¥2,178/mo) × 10 months | ~¥21,780 |
| C. Two-phase (recommended) | Sakura 5GB for 3 months (¥3,278×3) + Rakuten 20GB for 7 months (¥2,178×7) | ~¥25,080 |
Pattern C keeps English support early while saving about ¥18,700 versus Pattern A in this example (registration and SIM fees are extra). Pattern B is cheapest on paper but harder to set up immediately after arrival.
Frequently asked questions
Can I sign up for Rakuten Mobile or IIJmio right after arrival?
Sometimes yes, but often difficult without a residence card, address, payment method, and comfort with Japanese signup flows. Many mid-term residents start with a foreigner-friendly provider for 1–2 months, then switch once paperwork settles.
What if I need to leave Japan early?
Providers such as Mobal and Sakura Mobile often offer plans without long lock-ins, making cancellation easier (terms vary by provider and signup date). Standard MVNOs usually have modest cancellation fees, but check each provider’s terms before signing.
What should I recommend to friends?
Short tourists →
tourist SIM guide
. One-year-plus residents →
long-term resident SIM guide
. For friends on a 6–12 month stay, explain the two-phase approach in this article.
Where is the series hub?
See
foreigner-friendly mobile services hub
for stay-length entry points across the series.
What should you do next?
- Compare Mobal / Sakura Mobile and confirm total first-month cost on official sites
- Once your residence card, address, and payment are ready, choose Rakuten Mobile / IIJmio data tiers that match your usage
- Request an MNP reservation number about two weeks before switching and apply within 15 days
- Review campaign tactics in the
mobile cost-saving guide
Related Articles
Understanding foreigner-friendly mobile services in Japan
Best SIM cards for tourists in Japan
Best mobile plans for long-term residents
Foreigner-friendly mobile services hub
Sources
- Mobal Japan SIM Card (verified August 23, 2026) — Voice+Data / Voice Lite monthly and upfront fees
- Sakura Mobile Monthly Plans (verified August 23, 2026) — Monthly plans and registration fee
- Sakura Mobile Support: How much does a Monthly plan cost? (verified August 23, 2026) — Registration and billing structure
- Rakuten Mobile price list (PDF) (verified August 23, 2026) — Saikyo plan data tiers
- Rakuten Mobile Saikyo Plan (English) (verified August 23, 2026) — English fee overview
- IIJmio Giga plan (verified August 23, 2026) — Giga plan data tiers
- IIJmio fee table (verified August 23, 2026) — Voice SIM standard monthly fees
- MIC MNP materials (verified August 23, 2026) — 15-day MNP reservation validity