What a 10GB month costs in Japan
Same plan, same duration, five sellers. USD, checked 31 August 2026.
Holafly sells no fixed-data plans anywhere — its 30-day unlimited plan is $73.90, which is a different product and so is not plotted on the same scale.
Nomad
Nomad's 10GB for 30 days at $16 was the cheapest verified option, with Airalo at $18 close behind. For a ski trip where you're posting video daily, Saily's unlimited at $48.99 for 15 days gives you 5GB a day at full speed — more headroom than anyone else's unlimited.
See Nomad Japan plans →Every verified plan
Prices in US dollars, read off each provider’s own page. Where we could not confirm a price, we say so rather than estimate.
| Provider | Fixed data plans (USD) | Unlimited (USD) |
|---|---|---|
| Saily | 1GB/7d $3.99 · 3GB/30d $7.99 · 5GB/30d $10.99 · 10GB/30d $17.99 · 20GB/30d $24.99 | 15d $48.99 |
| Airalo | 1GB/3d $4 · 3GB/7d $8 · 5GB/7d $10 · 5GB/30d $11 · 10GB/30d $18 · 20GB/30d $25 | 3d $11.50 · 5d $17 · 7d $27 · 10d $34.50 · 15d $48 · 30d $69 |
| Nomad | 1GB/7d $4 · 3GB/30d $7 · 5GB/30d $10 · 10GB/30d $16 · 20GB/30d $23 · 50GB/30d $35 The 10GB and 20GB prices were sale prices at the time of checking (normally $18 and $26). | 3d $11 · 7d $25 · 14d $41 · 21d $49 |
| Ubigi | 1GB/7d $4 · 3GB/30d $7 · 10GB/7d $14 · 10GB/30d $17 · 25GB/30d $33 | 8d $24 · 15d $48 · 30d $69 |
| Holafly | No fixed-data plans — unlimited only | 3d $11.90 · 5d $20.50 · 7d $27.50 · 10d $36.50 · 15d $50.50 · 30d $73.90 |
Before you choose on price
The unlimited plans above are not unlimited. Here is what each one gives you at full speed.
| Provider | Full speed until | Then throttled to | Hotspot | Phone number |
|---|---|---|---|---|
| Saily | 5GB/day | 1 Mbps | Unlimited | Optional paid add-on |
| Airalo | 3GB/day | 1 Mbps | Unlimited | On some Data, Voice & Text packages and Discover+ |
| Holafly | ~2–3GB/day per third-party analysis; Holafly publishes no figure | 256–1024 kbps | 1GB/day | Never |
| Nomad | 2GB/day | 512 kbps | Supported | Thailand 50GB plan only, per review; otherwise unclear |
| Ubigi | No unlimited plan in several markets | n/a | Unlimited | Never — data only, no SMS |
Which network you actually roam onto
An eSIM is a roaming agreement with a local carrier. In Japan, that means:
| Provider | Local network |
|---|---|
| Holafly | KDDI and SoftBank |
| Saily | KDDI and SoftBank |
| Nomad | KDDI au and SoftBank |
| Airalo | SoftBank, plus one unnamed partner |
| Ubigi | Not disclosed |
When Australians go to Japan
The most seasonal major destination Australians visit — 159,090 trips in January against 61,650 in June, a 2.6x swing. Japan runs 103k–159k every month from December to April and briefly overtook Indonesia for second place in February 2026. Ski season is the whole story.