Quectel RG255C-GL in South Korea
The Quectel RG255C-GL rates good on all 3 networks in South Korea (SK Telecom, KT and LG U+). 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 100% | B1 B3 B7 B5 | — |
| KT | ✔ Good 100% | B1 B3 B8 | — |
| LG U+ | ✔ Good 100% | B1 B7 B5 | — |
Better-rated models here
In South Korea it is already among the best-rated models.
About the Quectel RG255C-GL
5G RedCap · global · Quectel12
- 4G B1 B2 B3 B4 B5 B7 B8 B12 B13 B14 B17 B18 B19 B20 B25 B26 B28 B30 B66 B70 B71 B34 B38 B39 B40 B41 B42 B43 B48
- 5G RedCap n1 n2 n3 n5 n7 n8 n12 n13 n14 n18 n20 n25 n26 n28 n30 n38 n40 n41 n48 n66 n70 n71 n77 n78 n79
The specification is a preliminary release; the module is certified on T-Mobile. 5G needs 5G SA with RedCap on the network; elsewhere it falls back to LTE Cat 4.
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 RG255C-GL in 46 countries →
Back to the home: ask, enter a model or bands, or compare models
Sources
- A RG255C-GL 5G RedCap Specification V1.0.0 (preliminary, 2023-09-28), as published by MC Technologies Quectel · 2023-09
- A T-Mobile IoT device certification: Quectel RG255C-GL, network certified T-Mobile · 2026-10-02
- C Permanent roaming in IoT: rules by country (2026) Thingsdata · 2026
