On this page 8 sections
Japan at a glance
Checked 4 November 2026- Cheapest plan listed
- $3.99Saily, 1 GB for 7 days (Nomad: $4)
- 7 days unlimited
- $26.50Airalo (Holafly: $27.50)
- Networks named
- SoftBank and KDDI, via Airalo, Holafly and Saily
- Our take
- 1–2 weeks: a 5–10 GB fixed plan from Nomad or Saily
Japan plans from these providers are data-only. Keep your home SIM for SMS codes.
Step 1: Estimate your data
A rough rule we use when planning: navigation, messaging and light browsing run in the hundreds of megabytes per day, while video streaming, video calls and uploading lots of photos can use several gigabytes per day. These are general estimates, not measurements, and your usage depends heavily on app settings (for example, whether your photos auto-upload to the cloud).
Week-long trip, maps and messaging, hotel Wi-Fi at night
3–5 GB fixed plan
Two weeks, lots of photos and social posts
10–20 GB fixed, or unlimited
Remote work, tethering a laptop
50 GB or generous unlimited
For tethering, check each plan's hotspot rules before you buy.
Step 2: Compare published prices
Unlimited-by-day plans
| Days | Airalo | Holafly | Saily |
|---|---|---|---|
| 3 days | $11.50 (lowest listed) | $11.90 | Priced per number of days (1–30) on the plan picker; 15 days shown at $48.99 |
| 5 days | $17.00 (lowest listed) | $20.50 | |
| 7 days | $26.50 (lowest listed) | $27.50 | |
| 10 days | $34.50 (lowest listed) | $36.50 | |
| 15 days | $48.00 (lowest listed) | $50.50 | |
| 30 days | $69.00 (lowest listed) | $73.90 | $71.99 |
Lowest listed price in the row Official pages, checked 4 November 2026. Nomad also sells unlimited Japan plans in several day lengths; we didn't capture their prices, so check its page directly.
Fixed-data plans
| Data and validity | Nomad | Saily |
|---|---|---|
| 1 GB / 7 days | $4 | $3.99 (lowest listed) |
| 3 GB / 30 days | $7 (lowest listed) | $7.99 |
| 5 GB / 30 days | $10 (lowest listed) | $10.99 |
| 10 GB / 30 days | $16 (sale; regular $18) (lowest listed) | $17.99 |
| 20 GB / 30 days | $23 (sale; regular $26) (lowest listed) | $24.99 |
| 50 GB / 30 days | $35 | — |
Lowest listed price in the row Airalo's Japan page showed unlimited packages when we checked; fixed-data options may appear under a separate tab. Official pages, checked 4 November 2026.
Step 3: Check the network and the fine print
- Networks. Airalo lists SoftBank (plus others); Holafly lists KDDI and SoftBank; Saily names KDDI and SoftBank as local partners. Japan's main networks cover cities well; all of these providers warn that remote mountains and islands can be weaker.
- Unlimited isn't always unlimited. Saily's unlimited is 5 GB/day at full speed, then 1 Mbps. Nomad says speed drops to 1 Mbps after the daily high-speed allowance. Holafly mentions a fair-usage policy that can slow speeds for up to a day, and limits hotspot sharing to 1 GB per day.
- Activation windows. Saily gives 180 days to activate; Nomad auto-starts a Japan plan 60 days after purchase if you haven't used it.
- No phone number. These Japan plans are data-only; Holafly and Nomad say so explicitly. Keep your home SIM for SMS codes.
Our take
For most visitors on a one- to two-week trip, a 5–10 GB fixed plan from Nomad or Saily costs a fraction of an unlimited plan and is enough if you use hotel Wi-Fi for heavy tasks. If you know you'll stream, video call or tether a lot, the unlimited packages from Airalo and Holafly are close in price. Pick the one whose rules (hotspot cap, refunds) suit you.
Affiliate links. Prices are set by the provider and confirmed at checkout.
Before you fly
Check your phone
Confirm it is unlocked and eSIM-capable (how to check).
Install at home
Install the eSIM on Wi-Fi, but keep its line off until you land (install guide).
Switch on when you land
Turn on the travel line, enable data roaming for that line, and set it as your mobile-data line.
Check entry rules
Check entry requirements on official government sources before you go. If you need visa or travel-document help, services such as iVisa exist, but the official government site is always the authority.
Frequently asked questions
How much does a Japan eSIM cost?
On the official pages we checked (4 November 2026), the smallest plans started at $3.99 (Saily, 1 GB for 7 days) and $4 (Nomad). Unlimited data for 7 days was $26.50 at Airalo and $27.50 at Holafly.
Which networks do Japan travel eSIMs use?
Airalo lists SoftBank plus other partners; Holafly lists KDDI and SoftBank; Saily names KDDI and SoftBank as local partners.
Do Japan eSIMs come with a phone number?
These Japan plans are data-only; Holafly and Nomad say so explicitly. Keep your home SIM installed for SMS codes.
When should I buy?
Close to your trip. Nomad auto-starts a Japan plan 60 days after purchase if you haven't used it; Saily gives 180 days to activate.
Sources and method
Last checked 4 November 2026
All prices and plan facts on this page were read from these official pages on 4 November 2026. We have not purchased or tested these plans ourselves; we summarize what the providers publish, in our own words. Read our method.
- Airalo — Japan eSIMsChecked 4 November 2026
- Holafly — eSIM for JapanChecked 4 November 2026
- Saily — eSIM for JapanChecked 4 November 2026
- Nomad — Japan eSIMChecked 4 November 2026
- Nomad Help Center — Is Nomad eSIM legit and any good?Checked 4 November 2026