Short answerCheck that the router supports the UK 4G bands, has the right LTE category for your data, has two SIM slots if you need network resilience, accepts external antennas, has the ports and power options you need, and can be managed remotely. Industrial routers from manufacturers such as Teltonika, Milesight, Robustel and InHand cover most business needs.
The router is a five-year decision; the SIM can change next month. Spending a little more on the right router saves site visits later.
The checklist
1. UK bands
It must support the main UK LTE bands: 1, 3, 7, 8 and 20, ideally 32, 38 and 40 too. Buy the European variant. See UK 4G bands.
2. LTE category
Cat 1 for low data, Cat 4 for most jobs, Cat 6 or higher for heavier use. See LTE categories.
3. One SIM or two
Dual-SIM routers can hold SIMs on two networks and switch if one fails. Note that most use one SIM at a time.
4. Failover and WAN
If 4G is backup, you need an Ethernet WAN port and automatic failover. See 4G backup broadband.
5. External antenna connectors
Detachable antennas on SMA connectors let you fit better antennas later. See antennas explained.
6. Ports, Wi-Fi and PoE
Count the Ethernet ports you need. Decide whether you need Wi-Fi at all. PoE out can power a camera or access point. Router Store has 4G routers with PoE and a note on 4G PoE routers.
7. Industrial interfaces
Serial (RS232/RS485), digital inputs and outputs, and Modbus support matter for telemetry and SCADA.
8. VPN and security
Look for OpenVPN, WireGuard and IPsec, a proper firewall and regular firmware updates.
9. Remote management
A cloud management platform lets you update, monitor and reach routers without a site visit. Teltonika’s RMS is one example; see what Teltonika RMS is.
10. Power and environment
Check the input voltage range (useful for vehicles and solar), operating temperature, DIN-rail mounting and the enclosure rating if it lives outdoors.
Manufacturers worth knowing
- Teltonika: a wide industrial range (RUT, RUTX, RUTM, TRB) with RMS management. Router Store has Teltonika 4G routers and a Teltonika router comparison.
- Milesight: industrial routers such as the UR32L, UR35 and UR41. See Milesight 4G routers.
- Robustel: industrial gateways and routers. See Robustel 4G routers.
- InHand Networks: industrial and edge routers. See InHand 4G routers.
- DrayTek and Zyxel: office routers with 4G built in or as a backup.
We review individual models in the router reviews section.
Frequently asked questions
Is a consumer 4G router OK for business?
For light office use it can be. For cabinets, vehicles, CCTV or anything unattended, an industrial router with remote management is far more dependable.
Do dual-SIM routers use both SIMs at once?
Most use one at a time and switch on failure. Routers with two modems, or bonding services, can use both together.
Can I manage routers without a fixed IP?
Yes. Cloud management platforms connect out from the router, so they work on any SIM.
NANick Appleby
Nick Appleby has worked in UK telecoms since 1998, starting at BT, and has spent most of that time on cellular routers, data SIMs and the antennas that connect them for business and industrial sites. He writes 4G SIM to explain how the networks and the kit actually behave, in plain English.