Nippon SIM Japan eSIM
3 plans on Docomo, SoftBank, au and Rakuten Mobile. 5 GB for a week from US$37.45. Prices checked .
Is Nippon SIM good for Japan?
Nippon SIM runs on Docomo, SoftBank, au and Rakuten Mobile, 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$37.45, the 59th cheapest of the 60 providers with a week plan. 1 unlimited plan, with no daily cap. How we rank Nippon SIM.
Japan plans
Shown in USD, converted from JPY at ECB rates of
| Data | Price | Compare | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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30 GB 30 days | $49.97 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
50 GB 180 days | $62.49 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unlimited | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Unlimited 8 days No daily cap | $37.45 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Nippon SIM speed and data rules
| Data at full speed | When it runs out | Plans |
|---|---|---|
| Unlimited | No daily cap | 1 plan |
| 30 to 50 GB | Nippon SIM doesn't say | 2 plans |
Nippon SIM: “Unlimited (High-Speed up to 3GB/Day)” Source
Nippon SIM reviews and speed tests
No customer reviews or published speed tests of Nippon SIM in Japan yet.
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
Rakuten Mobile- Download
- 53.54 MbpsQ3 2025
- 5G download
- 124.59 Mbps
- Time on 5G
- 37.4%
| 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 |
| Rakuten Mobile | 53.54 MbpsQ3 2025 | 124.59 Mbps | 37.4% | Not published |
Sources: Ookla Speedtest Connectivity Report H1 2026 via TelecomLead, 17 Sept 2026; Ookla Speedtest Intelligence Q3 2025 via TelecomsTechNews, 15 Dec 2025.
