Verdict
I haven’t personally used this provider. Below is the public picture, sourced from Sakura Mobile’s plans pages.
Sakura Mobile is the Japan-specialist option with the most flexible duration ladder in this comparison — every day from 1 to 90 priced individually on the Docomo plan — plus a separate 5G/4G au plan for travelers who want explicit 5G in metro areas. Buy if you want a Japan-resident-grade provider with English support and a single-purchase eSIM that covers anywhere from a one-day arrival buffer to a 90-day extended trip. Skip if you want the cheapest possible plan; Sakura’s per-day pricing runs roughly 2–3× competitor unlimited offerings, and a fixed-data plan from Nomad or Saily covers metro use for less.
What you actually get
Sakura Mobile sells two travel eSIMs for Japan:
- G Unlimited Data eSIM (Docomo) — runs on NTT Docomo, available in every-day durations from 1 to 90 days, priced from ¥1,650 (1 day, tax incl.) up to ¥26,400 (90 days). The cheaper of the two products. Strongest network for rural Japan, Hokkaido, the Japanese Alps, and longer Shinkansen routes.
- 5G/4G Unlimited Data eSIM (au) — “Recommended” — runs on KDDI au with explicit 5G/4G support, available in 4, 7, 10, 12, 15, 21, and 30-day tiers, priced from ¥4,400 (4 days) up to ¥14,850 (30 days). Sakura Mobile’s recommended pick; ~50% more expensive than the Docomo plan at comparable durations.
Both are data-only, no Japanese phone number, no SMS, no voice. Hotspot and tethering are supported. Activation is instant and fully online — no pickup, no shipping, no app required. No KYC. Sakura Mobile also sells a physical Travel SIM and a Pocket WiFi rental in parallel for travelers whose phones don’t support eSIM or who need a shareable hotspot.
Plans and pricing
Last verified May 2026.
G Unlimited Data eSIM (Docomo) — representative tiers (every day from 1 to 90 priced individually on Sakura’s site):
| Plan | Duration | Price (USD) | Price (JPY incl. tax) | Network |
|---|---|---|---|---|
| Unlimited | 1 day | ~$10.56 | ¥1,650 | NTT Docomo |
| Unlimited | 3 days | ~$17.59 | ¥2,750 | NTT Docomo |
| Unlimited | 7 days | ~$29.56 | ¥4,620 | NTT Docomo |
| Unlimited | 15 days | ~$45.74 | ¥7,150 | NTT Docomo |
| Unlimited | 30 days | ~$63.33 | ¥9,900 | NTT Docomo |
| Unlimited | 60 days | ~$116.11 | ¥18,150 | NTT Docomo |
| Unlimited | 90 days | ~$168.87 | ¥26,400 | NTT Docomo |
5G/4G Unlimited Data eSIM (au) — all listed tiers:
| Plan | Duration | Price (USD) | Price (JPY incl. tax) | Network |
|---|---|---|---|---|
| Unlimited | 4 days | ~$28.15 | ¥4,400 | KDDI au |
| Unlimited | 7 days | ~$35.18 | ¥5,500 | KDDI au |
| Unlimited | 10 days | ~$42.22 | ¥6,600 | KDDI au |
| Unlimited | 12 days | ~$49.26 | ¥7,700 | KDDI au |
| Unlimited | 15 days | ~$52.78 | ¥8,250 | KDDI au |
| Unlimited | 21 days | ~$84.44 | ¥13,200 | KDDI au |
| Unlimited | 30 days | ~$95.00 | ¥14,850 | KDDI au |
Pricing is JPY-native; payments are processed in JPY and the USD figures shown above are reference-only conversions at typical 2026 FX rates.
Throttling and Fair Usage Policy
Sakura Mobile does not publicly publish a Fair Usage Policy threshold for either travel-tier eSIM. As with any unlimited-marketed plan whose throttle threshold is not disclosed, treat it as “fine for typical city use, unknown limits if you stream, video-call, or hotspot heavily.” If sustained heavy use is critical, the Docomo plan’s 90-day duration paired with multiple top-up purchases (or a switch to a fixed-data competitor) is the safer shape.
What public reviews and policy pages say
Public reviews of Sakura Mobile consistently praise three things: English-language customer support, the Japan-specialist positioning (English-friendly checkout, no language barrier when something goes wrong), and the unusual every-day duration ladder on the Docomo plan that fits trips of any length without overpaying. The recurring caveats are pricing — Sakura sits in the premium tier of this comparison rather than competing on lowest price — and the absence of a published FUP threshold on either plan.
How to buy and activate Sakura Mobile
- Visit the Sakura Mobile travel page (no app required).
- Pick the Travel eSIM product (Docomo or au) and the duration you want.
- Pay online (cards, common Japanese and international payment methods, JPY billing).
- Receive the eSIM activation details by email — typically within minutes.
- Install via your phone’s eSIM settings (scan QR code or enter activation code).
- Set the Sakura Mobile eSIM as your Cellular Data line; keep your home SIM active for calls and SMS.
- On arrival in Japan, toggle Data Roaming on for the Sakura Mobile line.
Who should pick Sakura Mobile
- Long-stay traveler (30–90 days) — the Docomo plan’s 90-day single-purchase tier at ¥26,400 has no real equivalent on global apps without stacking three monthly subscriptions.
- Rural / Hokkaido / Japanese Alps traveler — the Docomo plan rides Japan’s widest-reach network and is one of the few Docomo-backed Japan-specialist eSIMs.
- Anyone who needs explicit 5G in metro areas — the au plan’s “5G/4G” branding is unambiguous; choose this when you specifically want fast metro 5G.
- First-time Japan visitor who values English-language customer support over global-app polish.
Who should skip Sakura Mobile
- Lowest-price hunter — Nomad’s $10 fixed 5 GB or Saily’s $10.99 fixed 5 GB cover a metro week for a fraction of Sakura’s $29.56 / 7-day Docomo plan, if you don’t need unlimited.
- Heavy hotspot user with FUP transparency requirements — neither Sakura plan publishes a daily threshold. Travelsim Asia (no FUP) or Ubigi (published 2 Mbps post-FUP) are safer.
- Anyone who wants both Docomo and au coverage in one eSIM — Sakura’s products are split. Travelsim Asia connects to all four Japanese carriers in a single eSIM.
Frequently asked questions
What network does Sakura Mobile use?
Both networks, on separate products. Sakura Mobile sells a “G Unlimited Data eSIM” that runs on NTT Docomo (durations from 1 to 90 days) and a “5G/4G Unlimited Data eSIM” that runs on KDDI au (4, 7, 10, 12, 15, 21, and 30-day tiers). The au plan is marked “Recommended” on their page and is the more expensive of the two; the Docomo plan is cheaper and the right pick if rural coverage matters.
How long can the Sakura Mobile travel eSIM run?
Up to 90 days on the Docomo plan (¥26,400 tax-incl, ~$169), with every-day granularity from 1 to 90 days. The au plan caps at 30 days. For working-holiday-style stays or extended sabbaticals, the 90-day Docomo single-purchase is unusual in this comparison — most global eSIM apps top out at 30 days.
Should I pick the Docomo plan or the au plan?
Pick the Docomo plan for rural coverage (Hokkaido, Japanese Alps, longer Shinkansen routes) and for the longest durations (60–90 days). Pick the au plan for explicit 5G in metro areas (Tokyo, Osaka, Kyoto) and if you want Sakura Mobile’s “Recommended” option. The au plan costs ~50% more at comparable durations.
Is Sakura Mobile English-friendly?
Yes. Sakura Mobile is one of the Japan-specialist providers explicitly aimed at international travelers and short-term residents. Documentation, checkout, and customer support are in English.
Do I need to register ID (KYC) for the Sakura Mobile eSIM?
The travel-tier data-only eSIMs do not require KYC — purchase, instant activation, fully online. KYC requirements in Japan apply to plans that include a Japanese phone number, which the travel-tier eSIMs do not.
Can I tether or hotspot on a Sakura Mobile eSIM?
Yes. Hotspot and tethering are listed as supported on both the Docomo and au travel eSIMs. Specific FUP thresholds are not publicly disclosed; verify with Sakura Mobile support if you’ll rely on sustained hotspot use.