What Ofcom’s Spring 2026 Connected Nations Update Means for Critical Connectivity

Ofcom published its Connected Nations Spring 2026 update on 13 May 2026, giving the latest snapshot of where the UK’s fixed and mobile networks stood as of January 2026.

Importantly, the data confirms that geographic mobile coverage from all four mobile network operators now extends to 84% of the UK, up from 66% before the SRN (Shared Rural Network) began. Coverage from at least one operator now exceeds 96%, compared with 91% pre‑SRN.

This reinforces the position that multi-RAN mobile solutions are a highly reliable and geo-available solution for many critical IoT applications such as security, telecare and public sector services.

For most readers, the headline is a good-news story: more fibre, more gigabit, more 4G and 5G. But national progress and local reliability are not the same thing, and for an organisation running a fire panel, a telecare alarm or a remote monitoring site, it is the local picture that decides whether a connection is there when it is needed.

The more important lesson sits beneath the headlines: resilience is no longer just about whether a network reaches a location, but whether a service can keep operating when one path, provider or technology layer changes.

This paper outlines CSL’s view on what the latest data means for critical connectivity, and why existing resilient estates are well placed for the next phase of network evolution.

Full-fibre availability:

• Reached 24.9 million UK residential premises, or 82% of the UK’s 30.5 million homes.
• Meaning, an additional 1.2 million homes with access to full fibre in just six months.
• Gigabit-capable broadband is now within reach of nearly 90% of homes (27.1 million), up from 87% in July 2025.
• Take-up is moving too: full-fibre connections across all UK premises rose by 1.8 million to 12.4 million.
• Ofcom’s separate planned deployments report points to continued expansion of full-fibre, gigabit-capable and fixed wireless access networks through to the end of 2028, reinforcing the need to design connectivity estates for transition rather than static coverage.

On mobile, Ofcom’s figures are based on the operators’ own signal-strength predictions rather than measured live performance: Ofcom collects predictions from each MNO and reports them, including Vodafone and Three as separate datasets pending full network integration. Geographic coverage is reported as a percentage of UK landmass.

• Predicted good outdoor 4G coverage from all four reported MNO datasets (meaning each network independently is predicted to cover that location) reached 84% of the UK landmass, a three-point increase, with notable gains for Vodafone and Three in rural areas.
• The equivalent figure when at least one operator covers the location held steady at 96%.

Indoor coverage matters more than landmass for devices that live inside buildings, and Ofcom reports it separately as a percentage of UK premises:

• Predicted 4G coverage inside premises reached 91% of UK premises from all four MNOs, and 99.7% from at least one operator.
• That 9-point indoor gap is much wider than the outdoor premises picture, where Ofcom reports that each MNO maintains at least 99% coverage outside UK premises.
• It widens further in rural areas: only 64% of rural premises have predicted indoor 4G coverage from all four MNOs while 98% have it from at least one, a 34-point gap.
• For an alarm panel, telecare unit or building sensor that operates inside a property, the indoor figures are the relevant ones, and that is where the multi-network advantage is most pronounced.

The 5G picture differs again. Ofcom reports it as the percentage of UK premises with 5G coverage in the area immediately outside the building, and does not yet report 5G indoor coverage in this dataset.

• Outdoor 5G coverage from all four MNOs rose from 47% to 64% of premises, and 5G Standalone (5G SA) outside-premises coverage now ranges from 49% to 85% across the three operators that have launched it.

The infrastructure is not just improving; it is improving quickly:

• Full fibre moved from 78% to 82% of premises in the six months since Ofcom’s Connected Nations 2025 report, and 5G outside-premises coverage from all MNOs from 47% to 64%.
• That earlier report also captured a notable demand-side shift: more than a million UK households were no longer using a landline by July 2025.
• The legacy stack is being left behind, and the Spring 2026 update shows the replacement infrastructure maturing in parallel.

Ofcom reports that the number of premises unable to access decent broadband from a fixed line or fixed wireless network has fallen to 39,000, down from 44,000. The bigger move is in affordability. Starlink has introduced a cheaper residential plan in selected parts of the UK, where a household installs a satellite dish at the property and connects to the LEO satellite constellation for home broadband. This is the dish-to-home service, not the direct-to-cell satellite-to-phone technology (sometimes called D2D) that some mobile operators are starting to pilot.

Once Ofcom counts the cheaper Starlink plan as an affordable option in the areas where it is available, only around 4,000 premises remain without access to affordable decent broadband. Those are small numbers against 30.5 million homes, but for the sectors CSL serves, the last few percent is the whole point. An alarm panel, a telecare unit, a remote pumping station or an EV charge point does not benefit from “national” coverage if its specific location sits in a not-spot. And the 39,000 figure is only the fixed-line picture; mobile coverage has its own gaps that do not map neatly onto it.

For example, consider a remote water pumping station that shows good 4G on a coverage map. If that connection depends on a single operator, a mast fault or maintenance window takes the site offline entirely. The coverage map was accurate, but it described one network on a normal day, not the moment something went wrong. The same logic applies to a single premises among the 39,000: nationally it is a rounding error, but if that one location houses a piece of critical infrastructure, the local consequence of a failure is out of all proportion to the statistic.

For critical connectivity, this is one of the strongest implications of the report. The gap between single-operator coverage and at-least-one-operator coverage is significant: any individual network leaves parts of the UK unserved, but coverage gaps do not perfectly overlap between operators. That is the principle behind unsteered, multi-network roaming SIMs and behind rSIM’s dual-core design, which is intended to add resilience beyond a single network path by supporting autonomous switching when connectivity is lost or degraded. The Spring 2026 data quietly reinforces why that matters: improvement is real, but uniformity is not, and critical devices cannot afford to be tied to a single provider’s footprint.

For CSL, resilience is built in layers: radio access, network choice, core-network independence, backhaul diversity, device behaviour and managed visibility. Coverage data describes the first of those layers; everything from a single-network failure to a backhaul fault, a cyber incident or a local outage can disrupt the others. Critical connectivity depends on the whole chain.

For life-critical, mission-critical and business-critical applications, the question is never simply “is there coverage here?” It is “what happens the moment the primary path fails?”

The continued expansion of 5G SA is one of the most strategically important long-term trends for IoT. Unlike non-standalone 5G, SA runs on a 5G core and unlocks the capabilities that matter for connected devices: lower latency, better support for massive device density, and ultimately network slicing. A range of 49% to 85% outdoor coverage shows this is still early, and uneven, but the direction is clear.

For CSL customers, this is a planning horizon rather than an immediate change. The practical implication is not to rush into unnecessary hardware refresh, but to make sure that when natural refresh cycles arrive, the connectivity strategy, SIM technology and routing choices selected can support the next generation of connected services. The network will evolve underneath devices already in the field; the goal is to position the estate so that change becomes an upgrade rather than a disruption.

One of the most telling lines in the update is that the near-elimination of the “no affordable decent broadband” category is driven largely by cheaper LEO satellite home broadband plans. Satellite is no longer only a niche last resort; for some premises and sites that terrestrial networks struggle to reach economically, it is now a credible primary or failover layer.

That aligns closely with how CSL already approaches resilience. Where line-of-sight, power resilience, service design and monitoring are properly addressed, LEO satellite connectivity integrated with intelligent router failover can shift critical traffic away from a terrestrial link when it degrades, helping keep building automation, security systems, remote monitoring and site operations running through disruption. Ofcom’s data shows LEO satellite becoming a more mainstream part of the connectivity mix; the advantage for critical applications lies in having satellite designed into a managed, monitored solution rather than bolted on after a failure.

Much of the analysis above is forward-looking, but most CSL customers reading this already have multi-network connectivity, alarm signalling hardware or routing deployed. The practical question is not whether the Spring 2026 data makes those estates obsolete. It does not. The question is how improving fibre, 4G, 5G and satellite availability can strengthen the resilience decisions already made.

For most existing CSL customers, the message is not “replace what you have”. It is “understand what you have, keep it aligned to the relevant network sunset timelines, and use natural refresh points to strengthen resilience further”.

If you’re on a CSL multi-network single-core SIM, the resilience principle is already built in. Multi-network single-core SIMs are not locked to one operator footprint, so improvements across available networks can strengthen the service environment without routine device-side change. In practice, this still depends on the device, the service configuration and local network conditions. The data supports the architectural logic of multi-network design: where a device can use more than one available network, the estate is better placed to benefit as national coverage improves and local coverage patterns shift.

If you operate non-5G alarm signalling hardware, 5G SA expansion is not a signal that your installed base is approaching obsolescence. Alarm signalling is different from the high-bandwidth, low-latency applications that 5G SA is designed for: it is typically low-bandwidth, event-driven traffic that does not usually require 5G SA capabilities such as network slicing or ultra-low latency. For many current deployments, the more relevant planning issues are the PSTN switch-off, due to complete by January 2027, and 2G retirement. The migration calendar already has clear waypoints: 3G is now largely complete; Virgin Media O2 withdrew inbound roaming on its 2G and 3G networks from 1 October 2025; EE’s 2G switch-off is scheduled from May 2029; VodafoneThree will follow during 2030; and all UK operators are committed to completing 2G retirement by 2033. These timelines matter more to most current signalling estates than the arrival of 5G SA. Plan upgrades around the network sunsets that actually affect your traffic, and treat 5G SA as a future opportunity rather than a deadline. The indoor 4G figures earlier in this update reinforce the case: the multi-network signalling architecture CSL customers are moving toward is becoming more reliable, not less, as the underlying network improves.

If you operate monitored security signalling, the Ofcom indoor coverage figures strengthen the resilience case. Intruder, access and monitored video systems sit inside buildings, and the indoor coverage gap between all-MNO and at-least-one-MNO coverage reinforces the value of path-diverse, grade-rated signalling. The underlying networks are getting better; the resilience that matters for monitored security is still built across multiple paths.

If you use the CSL router range, the report reinforces the architecture you already have. Routers are designed to absorb network change behind a stable application interface; primary connectivity can shift between cellular, fixed line and satellite while helping minimise disruption to the systems upstream. The growing role of LEO satellite, the multi-network advantage made visible by Ofcom’s coverage gaps, and the gradual arrival of 5G SA all point toward more layers behind the router, not fewer. Multi-WAN configurations and satellite failover age well against this picture.

The common thread is simple: resilient connectivity is built to absorb network change, and the Spring 2026 update is exactly the kind of change these architectures were designed for. For estates that stay aligned to network sunset timelines and service requirements, the investment compounds rather than depreciates as the underlying network improves.

The Connected Nations Spring 2026 update is, on balance, a positive backdrop. Better rural 4G, expanding 5G, more fibre and a shrinking decent-broadband gap all make connected devices easier to deploy and more dependable than a year ago. But the report also makes the case for resilience clearer than ever:

• The gaps are smaller but still real. Tens of thousands of premises remain hard to reach on fixed networks, and mobile not-spots persist. A single-network connection can still create a single point of failure.
• Multi-network is increasingly difficult to ignore. The persistent gap between
  at-least-one-operator and all-operator coverage is exactly why unsteered roaming and dual-core resilience matter.
• 5G SA is emerging. Build it into refresh planning. Choose connectivity and hardware that can ride the transition without a costly redesign.
• Satellite belongs in the resilience conversation. It is now mature enough to design in deliberately where the use case justifies it, not just to reach for in an emergency.

If you would like to review what the latest coverage picture means for your fire, security or telecare estate, CSL can help identify where your existing architecture is already well protected, where network changes may create new opportunities, and where resilience can be strengthened over time.

The Spring 2026 data reinforces CSL’s core view: resilient connectivity is not a single product or bearer. It is an architecture designed across every layer of the chain, from radio access through to managed visibility.

For related sector context, our earlier piece on Ofcom’s Connected Nations 2025 and telecare resilience explores how these connectivity trends affect life-safety applications. For our broader view on the trends shaping critical IoT connectivity in 2026, including legacy network sunsets, multi-network resilience, eSIM and 5G evolution, see our white paper Five Trends Shaping Critical IoT Connectivity in 2026.

1. Ofcom, Connected Nations update: Spring 2026, published 13 May 2026, including the downloadable summary tables from which the indoor 4G coverage figures are drawn
2. Ofcom, Connected Nations 2025, published 19 November 2025 (source for the July 2025 comparison figures and the household landline reduction)
3. Ofcom, Connected Nations – Planned Network Deployments 2026; GOV.UK
4. Moving landlines to digital technologies (PSTN switch-off)
5. Ofcom, Switching off the UK’s 2G and 3G mobile networks