Firsty Japan eSIM
2 plans on Docomo, au and SoftBank. 5 GB for a week from US$65.38. Prices checked .
Is Firsty good for Japan?
Firsty runs on Docomo, au and SoftBank, 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$65.38, the 60th cheapest of the 60 providers with a week plan. 5G on some plans. Hotspot allowed on some plans. 2 unlimited plans, 2 of them with 5 to 8 GB a day at full speed. Review rating 3.5 out of 5 from 467 customer reviews. How we rank Firsty.
Japan plans
Shown in USD, converted from EUR at ECB rates of
| Data | Price | Compare | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Unlimited | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Unlimited 1 day 8 GB a day at full speed, then 512 kbps | $3.91 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Unlimited 30 days 5 GB a day at full speed, then 512 kbps until the allowance refills, every 24 hours | $65.38 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Firsty speed and data rules
| Data at full speed | When it runs out | Plans |
|---|---|---|
| 8 GB a day | Slows to 512 kbpsMessages, maps and slow web pages, no video | 1 plan |
| 5 GB a day | Slows to 512 kbps until the allowance refills, every 24 hoursMessages, maps and slow web pages, no video | 1 plan |
Firsty: “Every 24 hours you get 5 GB at full speed” Source
Firsty ratings from customer reviews
467 reviews: 299 on the App Store, 162 on Google Play and 6 on Trustpilot, written 21 Feb 2024 to 11 Nov 2026. 7 of them are about a trip to Japan. Each rating needs at least 10 reviews that mention it.
Review rating3.5 out of 5The mean of the ratings below
| Aspect | Rating | Reviews that mention it |
|---|---|---|
| Speed | 2.6 out of 5 | 64 reviews |
| Coverage | 3.2 out of 5 | 131 reviews |
| Setup | 3.1 out of 5 | 73 reviews |
| Support | 4.3 out of 5 | 117 reviews |
| Value | 4.2 out of 5 | 154 reviews |
| App | 3.4 out of 5 | 141 reviews |
| Data problems | 6.0% of reviews | 28 of 467 reviews report one |
| Refund problems | 1.5% of reviews | 7 of 467 reviews report one |
Firsty speed tests in Japan
1 published speed test of Firsty in Japan, by Find Your eSIM.
- Shiba Park, Tokyo231 MbpsUpload 4.3 MbpsLatency 164 msFind Your eSIM, Nov 2025
| Where | Download | Upload | Latency | Tested by |
|---|---|---|---|---|
| Shiba Park, Tokyo | 231 Mbps | 4.3 Mbps | 164 ms | Find Your eSIMNov 2025 |
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.
