Ubigi Japan eSIM
5 plans on Docomo, SoftBank and au. 5 GB for a week from US$14.00. Prices checked .
Is Ubigi good for Japan?
Ubigi runs on Docomo, SoftBank and au, strong in all 10 areas on our coverage map, with good 4G at all 28 rural and mountain places. A week with 5 GB costs US$14.00, the 41st cheapest of the 60 providers with a week plan. Hotspot allowed. 2 unlimited plans. Review rating 2.6 out of 5 from 486 customer reviews. How we rank Ubigi.
Japan plans
| Data | Price | Compare | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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10 GB 7 days | $14.00 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
10 GB 30 days | $16.50 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
25 GB 30 days | $32.00 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unlimited: Slows to 2 Mbps after a usage limit for the rest of the plan | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Unlimited 15 days | $39.00 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Unlimited 30 days | $65.00 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Ubigi speed and data rules
| Data at full speed | When it runs out | Plans |
|---|---|---|
| Unlimited | Slows to 2 Mbps after a usage limit for the rest of the planBrowsing and music, not HD video | 2 plans |
| 10 to 25 GB | Ubigi doesn't say | 3 plans |
Ubigi: “includes 30GB of full speed data” Source
Ubigi ratings from customer reviews
486 reviews: 291 on the App Store, 183 on Google Play and 12 on Trustpilot, written 1 Sept 2023 to 12 Nov 2026. 74 of them are about a trip to Japan. Each rating needs at least 10 reviews that mention it.
Review rating2.6 out of 5The mean of the ratings below
| Aspect | Rating | Reviews that mention it | On Japan trips |
|---|---|---|---|
| Speed | 2.5 out of 5 | 62 reviews | Japan trips:2.6(14) |
| Coverage | 2.9 out of 5 | 254 reviews | Japan trips:3.1(55) |
| Setup | 2.8 out of 5 | 146 reviews | Japan trips:3.6(20) |
| Support | 1.6 out of 5 | 108 reviews | Japan trips:2.1(14) |
| Value | 3.3 out of 5 | 94 reviews | Japan trips:3.8(20) |
| App | 2.8 out of 5 | 142 reviews | Japan trips:2.4(17) |
| Data problems | 10.5% of reviews | 51 of 486 reviews report one | |
| Refund problems | 6.6% of reviews | 32 of 486 reviews report one | |
Ubigi speed tests in Japan
1 published speed test of Ubigi in Japan, by Find Your eSIM.
- Shiba Park, Tokyo389 MbpsUpload 68.7 MbpsLatency 87 msFind Your eSIM, Aug 2026
| Where | Download | Upload | Latency | Tested by |
|---|---|---|---|---|
| Shiba Park, Tokyo | 389 Mbps | 68.7 Mbps | 87 ms | Find Your eSIMAug 2026 |
How fast these networks are for their own customers
Ookla's median speeds for people on each network's own plans, H1 2026 unless marked.
NTT Docomo- Download
- 50.5 MbpsQ3 2025
- Time on 5G
- 51.4%
KDDI (au)- Download
- 67.85 Mbps
- Time on 5G
- 48.8%
SoftBank- Download
- 73.78 Mbps
- 5G download
- 153.55 Mbps
- Time on 5G
- 41.4%
- Latency
- 45 ms
| Network | Download | 5G download | Time on 5G | Latency |
|---|---|---|---|---|
| NTT Docomo | 50.5 MbpsQ3 2025 | Not published | 51.4% | Not published |
| KDDI (au) | 67.85 Mbps | Not published | 48.8% | Not published |
| SoftBank | 73.78 Mbps | 153.55 Mbps | 41.4% | 45 ms |
Sources: Ookla Speedtest Connectivity Report H1 2026 via TelecomLead, 17 Sept 2026; Ookla Speedtest Intelligence Q3 2025 via TelecomsTechNews, 15 Dec 2025.
