Best eSIM for Japan
For a typical 10–15 day Japan trip with ~10 GB, Ubigi and Nomad usually undercut Airalo and Saily on fixed data. Holafly only sells unlimited (by days) — better if you stream and video-call on your phone all day.
Comparison — ~10 GB / ~30 days (or unlimited equivalent)
Prices approx USD list (researched Aug–Oct 2026). Sale prices and promo codes change — always check the provider before buying.
| Provider | Data | Days | Approx price | Hotspot | Best for |
|---|---|---|---|---|---|
| Ubigi Value | 10 GB | 30 | US$16.50 | Yes | Best fixed-GB value for city trips |
| Nomad | 10 GB | 30 | US$16–18 | Yes | Strong mid-size fixed plans; KDDI/SoftBank |
| Saily | 10 GB | 30 | US$17.99 | Yes (shares pool) | Clean app; Nord Security extras |
| Airalo | 10 GB | 30 | US$18 | Yes (plan-dependent) | Familiar marketplace; easy top-ups |
| Holafly | Unlimited* | 30 | ~US$73.90 | ~1 GB/day typical prepaid | Heavy phone use; avoid if you tether a laptop |
*Holafly Japan is unlimited-only. Fair-use / FUP details are not always published — treat “unlimited” as day-priced phone data with a separate hotspot cap on prepaid plans.
Quick take
Light-to-moderate travellers: buy a 10 GB fixed plan from Ubigi or Nomad. Content creators glued to their phone: compare Holafly’s 7–15 day unlimited against Airalo’s unlimited tiers (often ~3 GB/day high-speed then throttle). Rural Hokkaido and remote areas can be thinner on SoftBank/KDDI than on docomo — if you need deep countryside coverage, check the live network list on the provider page.
FAQ
Is a travel eSIM cheaper than roaming?
Usually yes — a 10 GB travel eSIM typically costs a fraction of daily roaming passes from home carriers. Heavy users should still compare per-GB prices.
When should I install my travel eSIM?
Install it at home on Wi-Fi a day or two before you fly, but keep it switched off until you land, because many plans start their validity on first connection.
Is 'unlimited' eSIM data really unlimited?
Rarely. Most unlimited plans slow you down after a daily fair-use cap (often 1–5 GB/day) and limit hotspot use. Check the cap before you buy.