Quectel EC25-AF in South Korea
The Quectel EC25-AF rates good on 0 of 3 networks in South Korea. On SK Telecom it is limited, missing a coverage band. On KT it is not usable, missing a coverage band. On LG U+ it is limited, 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 | ◐ Limited 40% | B5 | — |
| KT | ✘ Not usable 0% | — | — |
| LG U+ | ◐ Limited 50% | 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-AF
Cat 4 · North America · Quectel123
- 4G B2 B4 B5 B12 B13 B14 B66 B71
The North American version for Verizon, AT&T, T-Mobile, U.S. Cellular, Rogers and Telus; no B1, B3, B7 or B20, so not for Europe or Asia.
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).4
All networks and bands in South Korea → · The Quectel EC25-AF in 46 countries →
Back to the home: ask, enter a model or bands, or compare models
Sources
- A EC25 Series LTE Standard Specification: variants and their bands, as published by Deutsche Telekom IoT Quectel · 2020
- A EC25 Series specification (bands of every variant), as published by Mouser Quectel · 2020
- C Quectel EC25-AF product listing (bands, North American carriers) everything RF · 2026-10-03
- C Permanent roaming in IoT: rules by country (2026) Thingsdata · 2026
