If you've been following the 5G rollout in the UK, you've probably come across the terms "5G NSA" and "5G SA." They sound similar, but the difference between them is significant — particularly if you're deploying IoT routers, remote monitoring systems, CCTV, or M2M connectivity.

In this article, we break down what each type of 5G actually means, where the UK networks currently stand, and what it all means for businesses relying on cellular connectivity.

What Is 5G NSA (Non-Standalone)?

5G Non-Standalone was the first version of 5G to reach the UK. It works by adding a new 5G radio layer on top of the existing 4G LTE network infrastructure. The 5G mast handles faster data transfer, but the underlying control signalling — things like setting up a connection, authentication, and managing your session — still runs through the older 4G core network.

Think of it like fitting a new, more powerful engine into an old car. You get more speed, but the chassis, gearbox, and brakes are all still the original parts. Performance improves, but only up to a point.

For most operators, NSA was a pragmatic first step. It allowed them to launch 5G services quickly and at lower cost by reusing their existing 4G infrastructure. Customers got faster download speeds and better capacity in congested areas, which was a genuine improvement over 4G alone.

However, NSA has limitations. Because it still relies on the 4G core, it cannot deliver the features that make 5G truly transformative: ultra-low latency, network slicing, and native support for massive numbers of IoT devices.

What Is 5G SA (Standalone)?

5G Standalone is the full, purpose-built version of 5G. It uses a completely new 5G core network alongside the 5G radio access network. There is no dependency on 4G infrastructure at all — the entire connection, from your device to the core, runs on 5G.

This architecture unlocks the capabilities that 5G was always designed to deliver:

• Ultra-low latency — response times drop dramatically, enabling real-time applications such as remote equipment control, autonomous vehicles, and live telemetry.
• Network slicing — operators can carve out dedicated virtual networks with guaranteed performance characteristics, tailored to specific use cases like industrial automation or emergency services.
• Massive machine-type communication (mMTC) — the network can support a far greater density of connected devices simultaneously, which is critical for large-scale IoT deployments.
• Improved energy efficiency — running a single network technology rather than two (4G + 5G) in parallel reduces power consumption at the infrastructure level.
• Enhanced security — SA introduces improved authentication and encryption protocols that are native to the 5G standard, rather than relying on inherited 4G security mechanisms.

A Quick Comparison

Where Does the UK Stand Today?

The UK's transition from NSA to SA is well underway. Vodafone was the first UK operator to launch 5G SA back in 2023, followed by O2 (Virgin Media) and EE in 2024.

EE has been particularly aggressive with its rollout, expanding its 5G SA network to cover over 66% of the UK population by late 2025, with coverage now spanning more than 44 million people across dozens of towns and cities. The operator is aiming for 99% population coverage by the end of 2030.

O2 has also been expanding its 5G SA footprint steadily, with coverage now reaching over 70% of the UK population across more than 700 locations, and it recently extended its network into Scotland and the West Midlands as part of a wider £700 million transformation plan.

The UK government has set a target of standalone 5G coverage across all populated areas by 2030, and Ofcom reported in late 2025 that SA coverage was already available across 83% of outdoor areas nationally.

What Does This Mean for IoT and M2M Deployments?

For businesses deploying IoT routers, CCTV systems, remote monitoring, or any kind of M2M connectivity, the shift from NSA to SA brings several practical benefits worth considering.

Better performance in dense environments. If you're running multiple connected devices at a single site — such as a warehouse, transport hub, or construction project — SA's increased capacity means less congestion and more reliable connections for each device.

Lower latency for time-sensitive applications. If your deployment relies on real-time data, whether that's live CCTV feeds, alarm panel monitoring, or telemetry from railway infrastructure, SA's reduced latency can make a noticeable difference to responsiveness.

Future-proofing your connectivity. NSA is a transitional technology. As operators continue to invest in SA and eventually retire older 4G infrastructure, devices and SIMs that can take advantage of SA will have a longer useful life.

Network slicing potential. As SA matures, the ability to provision dedicated network slices for specific IoT use cases could become a game-changer for sectors like utilities, transport, and public safety, where guaranteed uptime and performance are non-negotiable.

That said, it's important to be realistic. Not all IoT devices need 5G SA today. Many M2M applications — smart meters, environmental sensors, low-bandwidth telemetry — are perfectly well served by 4G LTE, LTE-M, or NB-IoT, and the right IoT SIM on the right network will be the best option for years to come. The right connectivity choice always depends on the specific use case, data requirements, and budget.

What About 5G RedCap?

There's one more piece of the 5G puzzle worth knowing about, especially if you work with IoT devices: 5G RedCap (Reduced Capability), sometimes called NR-Light.

RedCap was introduced in 3GPP Release 17 as a slimmed-down version of 5G NR, specifically designed for devices that need more performance than LTE-M or NB-IoT can offer, but don't need the full power of a standard 5G modem. It achieves this by reducing bandwidth, antenna complexity, and processing requirements — resulting in smaller, cheaper, and more power-efficient modules while still retaining key 5G SA benefits like network slicing, improved security, and low latency.

In practical terms, RedCap devices can reach speeds of up to around 220 Mbps downlink on a 20 MHz channel. That's far more than LTE-M or NB-IoT, and comfortably enough for applications like CCTV cameras, industrial sensors, wearables, smart grid monitors, and fleet tracking systems — all use cases where full gigabit 5G would be overkill (and too expensive).

Crucially, RedCap runs exclusively on 5G Standalone networks. This is one of the reasons the NSA-to-SA transition matters so much for the IoT sector: without SA infrastructure in place, RedCap devices simply cannot operate. As SA coverage expands across the UK, RedCap becomes increasingly viable as a deployment option.

The ecosystem is still maturing. Commercial RedCap modules from manufacturers like Quectel, Fibocom, and Telit Cinterion began appearing in 2024, and certified products are growing steadily through 2025 and 2026. Chipset support from Qualcomm, MediaTek, and Sequans is well established. Teltonika has already released several RedCap-ready routers including the RUT976, RUT271, and RUT276. Meanwhile, an even lighter variant — Enhanced RedCap (eRedCap) — is defined in 3GPP Release 18, targeting speeds of around 10 Mbps with even lower power consumption. The first eRedCap devices are expected commercially in 2026 and beyond, positioning them as a potential replacement path for LTE Cat-1 devices.

For Millbeck customers, RedCap is worth keeping on the radar. It won't replace LTE-M or NB-IoT for ultra-low-power, low-data-rate sensors any time soon, but for mid-tier IoT applications — particularly those involving video, richer telemetry, or higher device density — it represents a genuinely useful new tier of cellular connectivity that sits neatly between LPWAN and full 5G.

What Should You Do Now?

If you're planning a new IoT deployment or upgrading an existing one, it's worth thinking about 5G SA readiness as part of your decision-making process. That means considering whether your routers support SA, whether your SIM provider offers SA-compatible plans, and whether the locations you're deploying to have SA coverage from the relevant network operator.

At Millbeck, we supply IoT SIM solutions across all major UK and European networks, along with industrial-grade 4G and 5G routers from manufacturers like Teltonika — including 5G SA models such as the RUTX50 and RUTC50, and 5G RedCap routers like the RUT271. Whether you need a straightforward IoT SIM for a remote CCTV camera or you're exploring 5G SA connectivity for a larger-scale deployment, we can help you find the right solution.

Get in touch with our team to discuss your requirements — sales@millbeck.co.uk or call us on 0113 548 0770.