Does the JACS TD191-B work in South Korea?
✔ 3 networks good
Yes. The JACS TD191-B works on KT, LG U+ and SK Telecom, every network we track in South Korea.
- ✔ Good4G B1 B3 B8Evidence C · 2 sources
- ✔ Good4G B1 B5 B7Evidence C · 3 sources
- ✔ Good4G B1 B3 B5 B7Evidence C · 3 sources
- B5
- B8
- B3
- B1
- B7
below 1 GHz (coverage) 1–2.7 GHz 3–7 GHz mmWave · dashed = the JACS TD191-B lacks it · • = a main band
2G off on all networks (2012–2021)
3G being switched off: KT and SK Telecom 2027
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 · ◐ Japan 1/4 · ✔ Canada 3/3 · ◐ Australia 1/3
Similar models here: Dongle 400 · 3/3 good · MF833V · 3/3 good · Quectel EC200U-EU · 3/3 good
All 172 countries for the JACS TD191-B → · South Korea: every network →
Sources for this answer (5) · 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 South Korea country guide (sources: frequencycheck.com and others) Hyper Nexus · Sep 2026
- B On-air 4G carriers by operator: South Korea (carrier numbers observed, often with the licence record) Mast Database · mobile-spectrum-data (open data, LGPL-3.0) · 10 Oct 2026
- C LTE frequency bands Wikipedia · 30 Sep 2026
Network by network
| Network | Verdict | Main bands | 4G bands (✓ supported · ½ partly · ✗ missing) | 5G | LTE-M · NB-IoT |
|---|---|---|---|---|---|
| KT | ✔ Good 100% | — | B1✓ B3✓ B8✓ | n78 | LTE-M · NB-IoT |
| LG U+ | ✔ Good 100% | — | B1✓ B7✓ B5✓ | n78 | LTE-M · NB-IoT |
| SK Telecom | ✔ Good 100% | — | B1✓ B3✓ B7✓ B5✓ | n78 | LTE-M |
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.
