Does the JACS TD191-B work in Japan?
✔ 1 network good◐ 3 limited
Mostly. Good on SoftBank; limited on KDDI (au), NTT docomo and Rakuten Mobile. The reasons are on each card.
- ✔ Good4G B1 B3 B8Evidence A · 3 sources
- ◐ LimitedOnly 36% band match whyEvidence A · 3 sources
- ◐ LimitedOnly 50% band match whyEvidence A · 3 sources
- ◐ LimitedOnly 29% band match whyEvidence C · 5 sources
- B28 · missing
- B26 ½
- B18 · missing
- B19
- B8
- B11 · missing
- B21 · missing
- B3
- B1
- B41
- B42 · missing
None of the missing bands is a main band here, so they do not limit the verdict.
below 1 GHz (coverage) 1–2.7 GHz 3–7 GHz mmWave · dashed = the JACS TD191-B lacks it · • = a main band
KDDI (au) · The JACS TD191-B covers 36% of the band weight KDDI (au) uses (60% is needed for “good”).
NTT docomo · The JACS TD191-B covers 50% of the band weight NTT docomo uses (60% is needed for “good”).
Rakuten Mobile · The JACS TD191-B covers 29% of the band weight Rakuten Mobile uses (60% is needed for “good”).
2G off on all networks (2012)
3G off on all networks (2022–2026)
Long-term roaming is allowed (commercial agreements) (evidence B, checked 25 Oct 2026)
Same model, other markets (networks good): ✔ United States 3/3 · ◐ India 2/4 · ◐ Singapore 3/4 · ✔ Saudi Arabia 3/3 · ✔ United Kingdom 4/4 · ◐ New Zealand 0/3 · ✔ South Korea 3/3 · ✔ Canada 3/3 · ◐ Australia 1/3
Similar models here: Quectel EG21-G · 4/4 good · Quectel EG25-G · 4/4 good · Quectel EG912U-GL · 4/4 good
All 172 countries for the JACS TD191-B → · Japan: every network →
Sources for this answer (8) · evidence A = two or more sources, one official · B = one official source · C = industry and independent sources
- A TD191-B 4G LTE USB Dongle: product page and specifications (LTE FDD B1/B2/B3/B4/B5/B7/B8/B12/B13/B17/B20/B66/B71, TDD B39/B41) JACS Solutions · 5 Nov 2026
- A TD191-B datasheet (DS-TD191-B, Qualcomm MDM9x07, LTE Cat 4) JACS Solutions · Sep 2022
- C Frequency checker: Japan Kimovil · Sep 2026
- C Japan: frequencies by operator FrequencyCheck · Sep 2026
- A Use of each frequency band by the mobile operators (May 2026): assigned bandwidth and 4G/5G base stations per band, per operator Ministry of Internal Affairs and Communications (Japan) · May 2026
- B Rakuten Mobile wins the 700 MHz platinum band (4G so far on 1.7 GHz, Band 3, only) ITmedia Mobile · 23 Oct 2023
- B Rakuten Mobile starts commercial platinum-band service on 700 MHz (Band 28) Appllio · 27 Jun 2024
- B Rakuten users roamed on KDDI’s platinum band President Online · 2023
Network by network
| Network | Verdict | Main bands | 4G bands (✓ supported · ½ partly · ✗ missing) | 5G | LTE-M · NB-IoT |
|---|---|---|---|---|---|
| SoftBank | ✔ Good 100% | — | B1✓ B3✓ B8✓ B11✗ B28✗ B41✓ B42✗ | n1 n3 n28 n41 n77 n257 | LTE-M · NB-IoT |
| KDDI (au) | ◐ Limited 36% | — | B1✓ B3✓ B11✗ B18✗ B26½ B28✗ B41✓ B42✗ | n3 n28 n40 n41 n77 n78 n257 | LTE-M · NB-IoT |
| NTT docomo | ◐ Limited 50% | — | B1✓ B3✓ B19✓ B21✗ B28✗ B42✗ | n78 n79 n1 n28 n257 | LTE-M |
| Rakuten Mobile | ◐ Limited 29% | — | B3✓ B28✗ B18✗ B26½ | n77 n257 | — |
Verdicts come from the Band Atlas engine on the open data (CC BY 4.0, GitHub). Networks change: confirm with the operator before you deploy. This page is not legal or certification advice.
