Quectel EC25-MX in South Korea
The Quectel EC25-MX rates good on 2 of 3 networks in South Korea (SK Telecom and LG U+). On KT it is not usable, missing a coverage band. 3G switch-off: WCDMA licences (KT, SKT) by December 2026.
Network by network
| Network | Verdict | Bands in use it supports | Core bands missing |
|---|---|---|---|
| SK Telecom | ✔ Good 60% | B7 B5 | — |
| KT | ✘ Not usable 0% | — | — |
| LG U+ | ✔ Good 75% | B7 B5 | — |
Better-rated models here
- Quectel RM520N-GL 5G Sub-6 · global · Quectel · 3/3 Good
- Quectel EG912U-GL Cat 1 bis · global · Quectel · 3/3 Good
- Quectel EG25-G Cat 4 · global · Quectel · 3/3 Good
About the Quectel EC25-MX
- 4G B2 B4 B5 B7 B28 B66
Designed for Mexico: B4, B7 and B66 for Telcel, and B28, the only band Altán uses.
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 South Korea → · The Quectel EC25-MX in 46 countries →
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Sources
- A EC25 variants and their bands, as published by Deutsche Telekom IoT Quectel · 2021
- A EC25 Series specification (bands of every variant), as published by Mouser Quectel · 2020
- C Permanent roaming in IoT: rules by country (2026) Thingsdata · 2026
