SIMCom A7670E in Japan
The SIMCom A7670E rates good on 1 of 4 networks in Japan (SoftBank). On NTT docomo it is limited, missing a coverage band. On KDDI (au) it is limited, missing a coverage band. On Rakuten Mobile it is limited, missing a coverage band.
Network by network
| Network | Verdict | Bands in use it supports | Core bands missing |
|---|---|---|---|
| NTT docomo | ◐ Limited 50% | B1 B3 | — |
| KDDI (au) | ◐ Limited 27% | B1 B3 | — |
| SoftBank | ✔ Good 100% | B1 B3 B8 | — |
| Rakuten Mobile | ◐ Limited 29% | B3 | — |
Better-rated models here
- Quectel RM520N-GL 5G Sub-6 · global · Quectel · 4/4 Good
- Quectel RG255C-GL 5G RedCap · global · Quectel · 4/4 Good
- Quectel EG912U-GL Cat 1 bis · global · Quectel · 4/4 Good
About the SIMCom A7670E
Cat 1 · EMEA and parts of Asia · SIMCom12
- 4G B1 B3 B5 B7 B8 B20
The A7670E has no B28 and no Americas bands; where they are needed, choose the A7670SA from the same family (B1/2/3/4/5/7/8/28/66).
Network access: long-term roaming
Many globally deployed IoT devices use multi-network roaming SIMs that can attach to several networks in a country, but some countries restrict long-term roaming by foreign SIMs. A local SIM roaming domestically is not affected.
◐ Allowed under conditions: Allowed under certain conditions (one source so far).3
All networks and bands in Japan → · The SIMCom A7670E in 46 countries →
Back to the home: ask, enter a model or bands, or compare models
Sources
- A A7670 series specification: A7670C, A7670E and A7670SA bands, as published by Texim Europe SIMCom · 2026-10-02
- C SIMCom A7670E product listing (bands) everything RF · 2026-10-02
- C Permanent roaming in IoT: rules by country (2026) Thingsdata · 2026
