Does the JACS TD191-B work in Mexico?
✔ 2 networks good✘ 1 not usable
Mostly. Good on AT&T and Telcel; not usable on Altán. The reasons are on each card.
- ✔ GoodMain bands B2 B4Evidence C · 2 sources
- ✔ GoodMain bands B4Evidence C · 2 sources
- ✘ Not usableNo 4G band in common whyEvidence A · 2 sources
- • B28 · missing
- • B2
- • B4
- ★ B66
- B7
below 1 GHz (coverage) 1–2.7 GHz 3–7 GHz mmWave · dashed = the JACS TD191-B lacks it · • = a main band
Altán · Altán uses B28; the JACS TD191-B supports none of them.
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 · ✔ South Korea 3/3 · ✔ Canada 3/3
Similar models here: Quectel EC25-AU · 3/3 good · Quectel EC25-MX · 3/3 good · Quectel EG21-G · 3/3 good
All 172 countries for the JACS TD191-B → · Mexico: every network →
Sources for this answer (6) · 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 · Mexico Kimovil · 2 Oct 2026
- B Altán’s Red Compartida after three years: 700 MHz, while AT&T and Telcel run 4G-LTE on PCS (1900 MHz) and AWS (1.7/2.1 GHz) DPL News · 2020
- C Telcel (Mexico): frequency bands; B4 carries most of its LTE traffic FrequencyCheck · 2 Oct 2026
- A Red Compartida launch: a wholesale 4G-LTE network in the 700 MHz band for 92.2% of the population; IFT requires LTE terminals to enable band 28 Altán Redes · 2018
Network by network
| Network | Verdict | Main bands | 4G bands (✓ supported · ½ partly · ✗ missing) | 5G | LTE-M · NB-IoT |
|---|---|---|---|---|---|
| AT&T | ✔ Good 100% | B2 B4 | B2✓ B4✓ B5✓ B7✓ B26½ | n7 n41 n66 | LTE-M · NB-IoT |
| Telcel | ✔ Good 100% | B4 | B4✓ B7✓ B66✓ | n78 n5 | LTE-M · NB-IoT |
| Altán | ✘ Not usable 0% | B28 | B28✗ | — | 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.
