Does the JACS TD191-B work in Sri Lanka?
✔ 2 networks good◐ 1 limited
Mostly. Good on Hutch and Mobitel (SLT); limited on Dialog. The reasons are on each card.
- ✔ Good4G B3 B8Evidence C · 1 source
- ✔ Good4G B1 B3 B8Evidence C · 1 source
- ◐ LimitedOnly 50% band match whyEvidence C · 1 source
- B8
- B3
- B1
- B40 · 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
Dialog · The JACS TD191-B covers 50% of the band weight Dialog uses (60% is needed for “good”).
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 · ✔ South Korea 3/3 · ✔ Canada 3/3
Similar models here: Huawei E5577-320 · 3/3 good · Quectel EC200U-EU · 3/3 good · Quectel EC25-AU · 3/3 good
All 172 countries for the JACS TD191-B → · Sri Lanka: every network →
Sources for this answer (3) · 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 List of LTE networks in Asia (bands in use by operator) Wikipedia · 6 Oct 2026
Network by network
| Network | Verdict | Main bands | 4G bands (✓ supported · ½ partly · ✗ missing) | 5G | LTE-M · NB-IoT |
|---|---|---|---|---|---|
| Hutch | ✔ Good 100% | — | B3✓ B8✓ | — | — |
| Mobitel (SLT) | ✔ Good 100% | — | B1✓ B3✓ B8✓ | — | NB-IoT |
| Dialog | ◐ Limited 50% | — | B3✓ B40✗ | — | LTE-M · NB-IoT |
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.
