A cellular router is a router whose primary or backup internet connection comes from a 4G or 5G mobile network rather than a fixed line. The router contains a cellular modem and one or more SIM card slots, and provides connectivity to devices on its LAN side over Ethernet, Wi-Fi, or industrial serial interfaces.

In short: Cellular routers are used wherever fixed-line broadband is unavailable, unreliable, or commercially impractical. Common applications include CCTV at temporary sites, digital signage in retail, EV charging points, smart metering and energy infrastructure, vehicle and vessel connectivity, primary connectivity at remote industrial sites, and 4G/5G failover behind a fixed line. Industrial-grade cellular routers from Teltonika, Proroute, Robustel, Sierra Wireless/Semtech, and Cradlepoint are designed for continuous operation, wide temperature ranges, and the long deployment lifetimes typical of IoT.

The difference between a consumer 4G/5G hotspot and an industrial cellular router is substantial. Industrial routers offer features like dual SIM, hot failover, VPN protocol support, VLAN segmentation, industrial I/O, serial protocol support (Modbus, CAN, OPC UA), remote management platforms, and firmware lifetimes measured in years. A consumer hotspot is designed for short-term personal use; an industrial router is designed to be installed and forgotten for a decade.

Choosing the right cellular router depends on throughput needs (Cat 1, Cat 4, Cat 6, Cat 12, Cat 18, or 5G NSA/SA), the number and type of LAN ports required, the deployment environment (indoor, outdoor, vehicle-mounted, hazardous area), and the management approach (single-device WebUI, remote management platform, or carrier-managed). Millbeck stocks UK inventory across the most-deployed models and pre-configures APNs, VPNs, and RMS settings before dispatch.