Most 5G coverage announcements are aimed at smartphone users. Faster downloads. Better streaming. Lower latency on games. That story makes sense for consumers.

For IoT, it’s a different problem entirely.

A CCTV camera on a remote farm doesn’t need gigabit speeds. A smart meter sending 200 bytes of usage data every 15 minutes doesn’t need mmWave 5G. But both devices do need reliable, low-power, cost-effective connectivity that will still be supported in ten years.

That’s the gap 5G RedCap was built to fill.

What RedCap Actually Means

RedCap stands for Reduced Capability. The formal name is NR-Light – New Radio Light. It was standardised in 3GPP Release 17, published in 2022.

The idea is straightforward. Full 5G New Radio (NR) is expensive to implement in hardware. It requires wide antenna arrays, large modems, significant processing power and substantial battery capacity. For a smartphone, that’s fine. For a sensor that costs £30 and runs on a AA battery for three years, it’s a non-starter.

On the other end of the spectrum, NB-IoT and LTE-M (Cat-M1) are cheap and power-efficient, but their throughput is limited – typically under 1 Mbps. That works for sensors and meters, but not for CCTV or industrial cameras that need to push several megabits per second.

Cat 4 LTE sits in the middle and has served IoT well. But it’s a 4G technology with a finite lifespan as networks evolve toward 5G SA.

RedCap closes that gap. It’s a 5G technology with deliberately reduced hardware complexity, lower power draw and smaller device footprint than full 5G – but significantly higher throughput than LTE-M or NB-IoT.

RedCap Versus the Alternatives

It helps to see where RedCap sits against the other options:

Technology	Peak Downlink	Power Draw	Latency	Best For
NB-IoT	~250 Kbps	Very low	High	Sensors, meters, trackers
LTE-M (Cat-M1)	~1 Mbps	Low	Moderate	Wearables, trackers, meters
Cat 4 LTE	~150 Mbps	Moderate	Low	CCTV, routers, gateways
5G RedCap	~100 Mbps	Low-moderate	Very low	CCTV, industrial IoT, wearables
Full 5G NR	~1 Gbps+	High	Ultra-low	Video, AR/VR, dense data

RedCap targets the middle ground – devices that need more than LTE-M can offer, but don’t justify the cost and complexity of full 5G.

The 3GPP specification defines two RedCap categories:

Release 17 RedCap – up to 100 Mbps downlink, 50 Mbps uplink. This is the initial specification aimed at industrial sensors, CCTV and mid-range wearables.

Release 18 RedCap (eRedCap) – further reduced capability variant targeting lower-cost devices, with downlink speeds closer to LTE-M. This brings 5G to even simpler device classes.

Why 5G RedCap Matters for IoT Specifically

There are several reasons IoT deployments should pay attention to RedCap, even if widespread rollout is still ahead of us.

1. Network Lifecycle

4G LTE networks are not going away tomorrow. But they will eventually follow 2G and 3G into retirement. We’ve already watched 3G shut down in the UK. Devices deployed today need connectivity that will still be commercially supported in 2030 and beyond.

RedCap is a 5G technology. Devices built around it are investing in a network generation with a much longer runway than late-stage 4G.

2. Latency

Full 5G SA (Standalone) networks offer sub-millisecond latency. RedCap inherits this architecture. For most IoT applications, latency in the tens of milliseconds is perfectly acceptable – but there are industrial use cases where ultra-low latency matters. Real-time machine control, closed-loop automation, robotics coordination. RedCap on a 5G SA network can serve these applications at a hardware cost well below full 5G.

3. Spectral Efficiency

RedCap uses a minimum bandwidth of 5 MHz (versus 100 MHz for full 5G NR). This makes devices cheaper to build and easier to certify, while still operating on 5G spectrum and benefiting from 5G network slicing and quality-of-service features.

4. Device Density

5G was designed from the ground up to handle massive device density – far more devices per cell than LTE. RedCap inherits this. In deployments with hundreds of sensors or cameras in a concentrated area, this becomes relevant fast.

5. Power Efficiency

RedCap introduces features like Reduced Maximum Bandwidth and support for just one receive antenna (versus two for full 5G NR). Fewer antennas and narrower bandwidth mean lower power consumption. Not LTE-M levels of efficiency, but significantly better than full 5G – which matters for battery-powered devices.

Which IoT Applications Are the Right Fit for RedCap?

Not every IoT deployment needs RedCap. But several categories are a strong match.

CCTV and Video Surveillance

This is probably the most obvious use case. A CCTV camera needs several megabits of uplink throughput for live video. NB-IoT and LTE-M can’t deliver that. Cat 4 LTE can, but it’s a 4G technology. RedCap hits the sweet spot – 5G architecture, enough bandwidth for HD video, lower power than full 5G.

Remote cameras on construction sites, farms, retail forecourts and highways are exactly the kind of deployment that benefits.

Industrial Sensors and IIoT

Industrial IoT often involves sensors that need sub-second latency for process monitoring but relatively modest data rates. Temperature, pressure, flow rate, vibration – none of these generate huge data volumes, but some require fast feedback loops. RedCap’s latency advantage over LTE-M makes it attractive here.

Wearables and Body-Worn Devices

Healthcare wearables, lone worker devices, body cameras. These devices are battery-powered and physically small. Full 5G modem hardware doesn’t fit. LTE-M doesn’t have the bandwidth. RedCap was partly specified with this category in mind.

Smart Metering and Utilities

Higher-tier metering applications – advanced electricity meters transmitting detailed interval data, water network monitoring with frequent high-resolution readings – can push against LTE-M’s bandwidth ceiling. RedCap gives headroom without the overhead of full 5G.

Connected Vehicles and Roadside Infrastructure

V2X (vehicle to everything) communication and roadside sensor infrastructure need reliable low-latency 5G connectivity. Full 5G hardware is expensive to put in every lamp post. RedCap brings those costs down while retaining the 5G network architecture needed for V2X standards.

What RedCap Does Not Replace

It’s worth being clear about this. RedCap is not a universal IoT solution.

For simple sensors sending small amounts of data infrequently – soil moisture sensors, parking bay detectors, bin fill-level monitors – NB-IoT is still the right answer. It’s lower power, lower cost, and fits the job.

For devices that already work well on Cat 4 LTE and are mid-deployment lifecycle, there’s no reason to migrate to RedCap yet. The technology isn’t mature enough to justify ripping out working hardware.

RedCap is a forward-looking choice. It makes most sense for new deployments where the device will be in the field for five to ten years, where video or higher-throughput data is involved, or where ultra-low latency matters.

Where Are UK Networks With RedCap Right Now?

Honest answer: still early.

EE, Vodafone and Three have all referenced RedCap in their 5G roadmaps. Commercial RedCap device availability started emerging in 2024 with Qualcomm’s Snapdragon X35 modem and MediaTek’s T300 chipset. Router manufacturers including Teltonika have begun integrating RedCap-capable modules.

UK network-side support for RedCap on 5G SA infrastructure is being rolled out progressively. NSA (Non-Standalone) 5G networks – which still rely on a 4G core – do not support the full RedCap feature set, particularly around latency and network slicing.

The practical reality for most UK IoT deployments in 2025 is that Cat 4 LTE and Cat 6 LTE remain the workhorse technologies, with full 5G available where high throughput is genuinely needed. RedCap sits on the near horizon – relevant for device procurement decisions being made today, deployable at scale likely within two to three years as SA coverage expands.

What This Means for SIM Selection

A 5G RedCap router or device still needs a SIM card. And that SIM needs to be capable of operating on 5G networks.

Standard IoT SIM cards that support 5G NSA and SA bands will work with RedCap devices, provided the SIM is provisioned on an appropriate APN and the network has RedCap enabled. There are no RedCap-specific SIM variants – the intelligence sits in the device modem and the network infrastructure.

What does matter is choosing a SIM from a provider that has 5G roaming agreements across all major UK networks, not just one. If your RedCap device connects to EE’s 5G SA network but your SIM only has a 5G agreement with Vodafone, it will fall back to 4G. For a technology designed to deliver 5G latency improvements, that defeats the purpose.

Multi-network IoT SIMs with 5G support across EE, Vodafone, Three and O2 are the right foundation for RedCap deployments.

The Short Version

5G RedCap is a mid-tier 5G standard designed for devices that don’t need gigabit speeds but do need more than LTE-M can deliver. It’s lower power, lower cost and less complex than full 5G hardware, while still operating natively on 5G networks.

For IoT, it targets CCTV, industrial sensors, wearables and connected infrastructure. It’s not a replacement for NB-IoT at the low end or full 5G at the high end. It fills the gap that LTE Cat 4 currently occupies – but on a 5G network with a much longer commercial lifespan.

UK network and device availability is progressing. If you’re specifying devices for deployments that will be live in 2026 and beyond, RedCap is worth factoring into your hardware decision now.

If you want to discuss 5G-capable SIM options for a current or upcoming deployment, get in touch with our team.

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