Head-to-head · Japan eSIM Plans
Ubigi vs IIJ Japan Travel SIM/Digital
Ubigi leads on 0 checks, IIJ Japan Travel SIM/Digital on 0, and 3 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.
Our verdict
- Highest scoreUbigi · 8.6/10
Ubigi scores higher on our rubric for japan esim plans: 8.6 against 8.4 out of 10; our editors rank them #6 and #7.
Ubigi is the better fit for travelers who value a reusable eSIM across destinations. IIJ Japan Travel SIM/Digital is the better fit for travelers wanting large data bundles on Docomo LTE.
- Ubigi fits best
Travelers who value a reusable eSIM across destinations
- IIJ Japan Travel SIM/Digital fits best
Travelers wanting large data bundles on Docomo LTE
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Side by side
| Feature | Ubigi 8.6/10 Visit ↗ | IIJ Japan Travel SIM/Digital 8.4/10 Visit ↗ |
|---|---|---|
| At a glance | ||
| Editor score | 8.6 | 8.4 |
| Ranking | #6 in Japan eSIM Plans | #7 in Japan eSIM Plans |
| Best for | Travelers who value a reusable eSIM across destinations | Travelers wanting large data bundles on Docomo LTE |
| Pricing model | Paid | Paid |
| Starting price | Not published | Not published |
| Free plan | — | — |
| Free trial | — | — |
| Deployment | Cloud, Mobile | Mobile |
| Platforms | Web, iOS, Android, Windows | iOS, Android |
| Support | Docs | Live chat, Phone · 24/7 |
| Built for | Solo, Small business | Solo, Small business |
| Features Ubigi 1/1 · IIJ Japan Travel SIM/Digital 1/1 | ||
| Hotspot support | ✓ | ✓ |
| Specs | ||
| Data type | Fixed | Fixed |
| Data allowance | 1 GB | 3 GB |
| Validity | 30 days | 30 days |
| Coverage scope | Japan_only | Japan_only |
| Activation timing | First_connection | First_connection |
| Our review | ||
| Pros |
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| Cons |
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| Our verdict | Ubigi offers prepaid, data-only eSIM plans for travelers in Japan and other destinations. The Japan 1GB plan costs $4 USD as a one-time purchase and includes 1 GB valid for 30 days. It suits travelers who want a reusable eSIM for plans… Read the review → |
IIJ Japan Travel SIM/Digital is a prepaid, data-only eSIM for visitors to Japan and temporary returnees who want a fixed data allowance rather than voice or SMS service. Its seven 30-day options range from 3 GB to 55 GB and use Japan-wide… Read the review → |
Strengths and trade-offs
Ubigi — where it wins
- Japan 1GB costs $4 once and is valid for 30 days
- Monitor data balance and top up through the app or website
- Share data through smartphone hotspot use
Where it doesn't
- The Japan entry plan includes only 1 GB of fixed data
- Data-only service does not provide traditional calls or SMS
- Requires an unlocked, eSIM-compatible device
IIJ Japan Travel SIM/Digital — where it wins
- Seven fixed-data options from 3 GB to 55 GB, each valid for 30 days
- Japan-wide NTT DOCOMO 4G LTE coverage
- Data can be recharged during the usage period
Where it doesn't
- Data-only service; no voice or SMS
- eSIM installation requires online registration after purchase
- Mobile support is limited to iOS and Android
- Ubigi8.6/10 · From $4
A $4 Japan plan pairs 1 GB for 30 days with a reusable eSIM and hotspot sharing.
Visit UbigiFull verdict → - IIJ Japan Travel SIM/Digital8.4/10 · Paid
A data-only Japan eSIM with 3–55 GB bundles and 30-day validity.
Visit IIJFull verdict →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update