Instabridge Japan eSIM
4 plans on Docomo and SoftBank. 5 GB for a week from US$15.69. Prices checked .
Is Instabridge good for Japan?
Instabridge runs on Docomo 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$15.69, the 43rd cheapest of the 60 providers with a week plan. 5G on every plan. Review rating 2.8 out of 5 from 68 customer reviews. How we rank Instabridge.
Japan plans
Shown in USD, converted from AUD at ECB rates of
| Data | Price | Compare |
|---|---|---|
1 GB 7 days 1 GB at full speed, then data stops | $2.39 | |
3 GB 15 days 3 GB at full speed, then data stops | $5.46 | |
10 GB 30 days 10 GB at full speed, then data stops | $15.69 | |
20 GB 7 days 20 GB at full speed, then data stops | $23.87 |
Instabridge speed and data rules
| Data at full speed | When it runs out | Plans |
|---|---|---|
| 1 to 20 GB | Data stops | 4 plans |
Instabridge: “you won't be able to access the internet unless you purchase additional data” Source
Instabridge ratings from customer reviews
68 reviews: 57 on the App Store, 8 on Trustpilot and 3 on Google Play, written 19 Feb 2016 to 12 Nov 2026. 0 of them are about a trip to Japan. Each rating needs at least 10 reviews that mention it.
Review rating2.8 out of 5The mean of the ratings below
| Aspect | Rating | Reviews that mention it |
|---|---|---|
| Speed | Not enough reviews | 2 reviews |
| Coverage | 2.5 out of 5 | 14 reviews |
| Setup | 2.7 out of 5 | 15 reviews |
| Support | 2.5 out of 5 | 15 reviews |
| Value | 3.6 out of 5 | 21 reviews |
| App | 2.9 out of 5 | 33 reviews |
| Data problems | 13.2% of reviews | 9 of 68 reviews report one |
| Refund problems | 5.9% of reviews | 4 of 68 reviews report one |
Instabridge speed tests in Japan
No published speed tests of Instabridge in Japan.
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%
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 |
| 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.
