IIJmio Japan Travel SIM
7 plans on Docomo. 5 GB for a week from US$18.66. Prices checked .
Is IIJmio Japan Travel SIM good for Japan?
IIJmio Japan Travel SIM runs on Docomo, 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$18.66, the 45th cheapest of the 60 providers with a week plan. How we rank IIJmio Japan Travel SIM.
Japan plans
Shown in USD, converted from JPY at ECB rates of
| Data | Price | Compare |
|---|---|---|
3 GB 30 days | $15.53 | |
6 GB 30 days | $18.66 | |
10 GB 30 days | $20.54 | |
15 GB 30 days | $21.79 | |
25 GB 30 days | $28.68 | |
35 GB 30 days | $31.18 | |
55 GB 30 days | $36.19 |
IIJmio Japan Travel SIM speed and data rules
IIJmio Japan Travel SIM doesn't say what happens when a plan's full-speed data runs out.
IIJmio Japan Travel SIM: “30 days from the start of use for data communication” Source
IIJmio Japan Travel SIM reviews and speed tests
No customer reviews or published speed tests of IIJmio Japan Travel SIM in Japan yet.
How fast this network is 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%
| Network | Download | 5G download | Time on 5G | Latency |
|---|---|---|---|---|
| NTT Docomo | 50.5 MbpsQ3 2025 | Not published | 51.4% | Not published |
Sources: Ookla Speedtest Connectivity Report H1 2026 via TelecomLead, 17 Sept 2026; Ookla Speedtest Intelligence Q3 2025 via TelecomsTechNews, 15 Dec 2025.
