---
title: "RGSM: MCC 420 MNC 21"
mcc: "420"
mnc: "21"
plmn: "42021"
brand: "RGSM"
operator: "Saudi Railways GSM"
country: "Saudi Arabia"
country_iso: "SA"
region: "Asia & Middle East"
technologies: ["2G"]
updated: "2025-04-09"
canonical: "https://mcc-mnc.org/networks/420_21"
---

# RGSM: MCC 420, MNC 21 (Saudi Arabia)

**RGSM** (operator: Saudi Railways GSM) is a mobile network in [Saudi Arabia](https://mcc-mnc.org/countries/saudi_arabia.md) (Asia & Middle East), identified by MCC **420** and MNC **21**: PLMN ID 42021, also written 420-21 or 420 21. It runs 2G.

## Identifiers

| Field | Value |
|---|---|
| MCC (Mobile Country Code) | 420 |
| MNC (Mobile Network Code) | 21 |
| PLMN ID (MCC+MNC) | 42021 |
| TADIG code | — |
| Brand | RGSM |
| Operator | Saudi Railways GSM |
| Country | Saudi Arabia (SA) |
| Region | Asia & Middle East |
| Dialling code | — |
| Technologies | 2G |
| Last updated | 2025-04-09 |

## Technologies & bands

| Generation | Bands | Measured cells |
|---|---|---|
| 2G | [GSM-R 900](https://mcc-mnc.org/coverage/gsm-r_900.md) | — |

## Voice & calling services

| Service | Status | Source |
|---|---|---|
| VoLTE | Unknown | — |
| VoWiFi | Unknown | — |
| ViLTE | Unknown | — |
| VoNR | Unknown | — |

A service not marked Supported or Not supported is unknown: no data either way, not a sign that the network lacks it.

## About RGSM

Saudi Railways GSM (RGSM), operating in Saudi Arabia under Mobile Country Code (MCC) 420 and Mobile Network Code (MNC) 21, provides essential communication infrastructure for railway operations. RGSM ensures reliable connectivity for train control, signaling, and voice communication for railway staff across the vast Saudi Arabian rail network. This network plays a critical role in the efficiency and safety of passenger and freight transport within the Kingdom, a region where robust infrastructure is vital due to its geographical size and strategic importance in the Middle East. Understanding RGSM's role highlights the specific needs of industrial telecommunications compared to public mobile networks like Saudi Telecom Company (STC), Mobily, or Zain KSA, which cater to individual consumer usage.

Being dedicated to railway communication offers unique optimization opportunities for RGSM. Unlike general mobile networks which handle diverse data traffic patterns across Saudi Arabia’s populous cities (like Riyadh, Jeddah, and Mecca) and its more remote regions, RGSM’s network can be specifically tuned to the demands of its railway operations. This concentration on railway-specific needs permits the implementation of specialized technologies and frequency bands tailored to enhancing safety and performance. The 420-21 MCC/MNC designation clearly identifies this specialized network within a broader landscape of mobile operators serving Asia and the Middle East, ensuring its distinct functionality is recognised within the global telecommunications environment.

## Other networks in Saudi Arabia

| MCC | MNC | Network | TADIG |
|---|---|---|---|
| 420 | 01 | [Al Jawal STC](https://mcc-mnc.org/networks/420_01.md) | SAUAJ |
| 420 | 03 | [Mobily](https://mcc-mnc.org/networks/420_03.md) | SAUET |
| 420 | 04 | [Zain SA](https://mcc-mnc.org/networks/420_04.md) | SAUZN |
| 420 | 05 | [Virgin Mobile](https://mcc-mnc.org/networks/420_05.md) | — |
| 420 | 06 | [Lebara Mobile](https://mcc-mnc.org/networks/420_06.md) | SAULB |
| 420 | 09 | [Salam](https://mcc-mnc.org/networks/420_09.md) | — |
| 420 | 10 | [RedBull](https://mcc-mnc.org/networks/420_10.md) | — |

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