As we move deeper into 2026, a critical shift is underway in the UK mobile landscape. While operators including EE, Vodafone, Three, and O2/VMO2 continue aggressive 5G rollout and fixed wireless access (FWA) expansion, evidence suggests 4G networks—still the backbone for millions of users, particularly in rural areas—are beginning to show signs of strain.

For consumers in areas with patchy 5G coverage, users on older devices, and rural residents who rely on 4G as a primary connectivity solution, this trend raises urgent questions: Are networks becoming congested? Are download speeds declining? And what does this mean for fallback coverage when 5G isn't available?

The Reality of 4G Under Pressure

The UK has 4G coverage reaching approximately 99.6% of the population, according to Ofcom's most recent Connected Nations report. However, coverage and congestion are two different metrics. While 4G is almost universally available, actual data throughput—the speed you experience during peak times—is a separate concern.

Throughout 2025 and into 2026, network operators have shifted significant capital expenditure (CapEx) toward 5G infrastructure and FWA deployment, particularly in underserved rural and suburban areas. This strategic pivot is logical: 5G offers higher spectral efficiency, supports business services, and generates premium tariff revenue. FWA, meanwhile, is positioned as a direct competitor to fixed-line broadband for homes without fibre access.

However, this investment rebalancing has not been neutral for 4G networks. Spectrum that previously carried 4G traffic has, in some cases, been repurposed to support 5G, while maintenance cycles and hardware upgrades on legacy 4G infrastructure have reportedly been deprioritised in favour of newer technologies.

Anecdotal reports from users across the UK—documented in forums, social media, and customer service complaints to Ofcom—indicate that peak-time 4G speeds have softened in urban centres where 5G is heavily deployed, and in certain rural areas where operators have redirected backhaul investment toward FWA nodes rather than traditional 4G cell sites.

What Ofcom Data Tells Us About 4G Performance

Ofcom's regulatory oversight remains the gold standard for understanding network performance across the UK. The regulator's most recent Connected Nations report (2024) provided detailed coverage maps and speed benchmarks, though real-time performance metrics require continuous monitoring.

Ofcom's Mobile Network Performance reports, published quarterly, include measured 4G and 5G speeds across operators and regions. Latest data shows:

  • Urban 4G speeds: Median download speeds in city centres remain stable at approximately 35–50 Mbps, but peak-hour throughput variability has increased, indicating congestion during busy periods.
  • Rural 4G speeds: In areas with single-operator or dual-operator coverage, rural 4G median speeds range from 10–25 Mbps, with higher variance in areas where operators are actively directing users to FWA alternatives.
  • 5G rollout impact: In cities where 5G small-cell density is high (London, Manchester, Birmingham), 4G capacity has visibly reduced as spectrum and backhaul resources are reallocated.

Ofcom has not formally declared a 4G congestion crisis, but the regulator has flagged in recent consultations that legacy 4G maintenance and spectrum allocation warrant continued oversight as operators mature their 5G portfolios.

Rural Fallback: The 4G Dependency Challenge

Rural areas present the starkest picture of 4G's ongoing criticality. While fixed wireless access via 5G has expanded rapidly—particularly in Scotland and the Midlands—vast swathes of rural Britain remain dependent on 4G as their primary mobile broadband solution, and often their only viable connectivity option.

For rural users, the concern is twofold:

  1. Spectrum reallocation: Some operators have repurposed 4G spectrum bands to support 5G, reducing the bandwidth available for 4G fallback in areas where 5G coverage remains patchy.
  2. Site maintenance delays: Legacy 4G cell sites in remote areas may see extended replacement cycles or deferred upgrades, as operators prioritise high-density urban 5G deployments and rural 5G FWA nodes.

In Scottish Highlands and Islands, where Ofcom's Connected Nations data shows pockets of single-operator 4G coverage, anecdotal evidence from local community groups suggests that speeds during peak hours have declined by 15–25% over the past 12 months, coinciding with operator investment shifts toward 5G FWA infrastructure.

For residents in these areas who depend on 4G as a fallback or primary service, the implications are serious: reduced peak-hour throughput can impact remote working, education, and access to essential online services.

Operator Strategies and Investment Trade-Offs

Each major UK operator is navigating the 4G-to-5G transition differently, but the underlying economics are similar.

EE (BT Group) has committed to comprehensive 5G coverage and aggressive FWA rollout to compete with Openreach's fibre footprint. Internal documents and investor presentations suggest 4G is increasingly viewed as a legacy fallback rather than a growth platform, with CapEx flowing toward 5G and FWA.

Vodafone is pursuing a similar strategy, with 5G and FWA as growth vectors. Rural 4G coverage remains solid, but investment intensity in 4G maintenance has reportedly declined relative to prior years.

Three has taken a more measured approach to 5G, partly due to legacy spectrum constraints and lower CapEx relative to rivals. As a result, Three's 4G network remains relatively well-resourced, and the operator has maintained stronger 4G speeds in its coverage footprint. However, Three's overall coverage footprint is smaller than competitors, meaning its 4G users often lack seamless fallback options.

O2/VMO2 has similarly prioritised FWA and 5G, with 4G treated as a stable, lower-growth platform. Speed complaints in O2's service areas have been reported in customer forums, though Ofcom has not yet formally cited O2 for performance failures.

The strategic logic is clear: 5G offers higher spectral efficiency, supports emerging services (IoT, enterprise connectivity), and commands premium pricing. FWA targets fixed-line competitors and underserved markets. 4G, by contrast, is a mature, lower-margin service with limited growth upside. From an investor perspective, rebalancing CapEx away from 4G maintenance toward these growth areas makes financial sense.

However, from a consumer protection and universal service obligation perspective, the question remains: are operators doing enough to maintain 4G as a reliable fallback?

User Reports and Crowd-Sourced Data

Beyond official Ofcom reports, crowd-sourced speed-test platforms and user forums provide real-time insight into perceived network performance. While individual tests are not scientific, aggregate patterns over months can reveal genuine trends.

Ookla Speedtest data (publicly available aggregates) shows that median UK 4G download speeds have remained relatively flat year-on-year (approximately 35–45 Mbps nationwide average), but variance during peak hours has increased, suggesting more congestion-induced speed variability rather than wholesale decline.

OpenSignal reports and community forums have flagged recurring complaints in specific areas:

  • Central London during rush hours (4G slowdowns coinciding with high 5G uptake in surrounding areas)
  • Peak-time congestion in Manchester city centre
  • Rural Scotland, where single-operator coverage areas show declining speeds during evening peaks
  • Parts of the Midlands and South West where FWA has begun rollout but 4G capacity has not yet been rebased

These reports, while anecdotal, align with the strategic shift documented in operator investor presentations and regulatory filings.

The Regulatory Response

Ofcom continues to monitor 4G performance and has signalled that operator obligations—including those related to quality of service and universal service provisions—remain enforceable. However, the regulator's recent consultations suggest a relatively permissive stance on operators' 5G and FWA prioritisation, provided that 4G fallback remains available and broadly functional.

In its 2024 Strategic Review consultation, Ofcom noted that spectrum flexibility and operator investment freedom are critical to enabling competition and innovation. The regulator has not imposed hard targets on 4G maintenance, instead relying on market competition and customer choice to incentivise service quality.

This hands-off approach works in competitive urban markets (London, Manchester) where users can switch operators if 4G performance declines. In rural areas with single or dual-operator coverage, however, consumer choice is limited, and regulatory oversight may need to sharpen if 4G quality deteriorates further.

Implications for Fixed Wireless Access (FWA) Adoption

Interestingly, 4G congestion and 5G FWA rollout are interconnected. As operators deploy 5G FWA nodes to compete in the fixed broadband market, they are simultaneously encouraging existing 4G users to transition to these newer services. This creates a subtle but real incentive to allow 4G performance to soften, nudging users toward upgrade paths.

For consumers, this dynamic has mixed implications. On one hand, those eligible for FWA (typically suburban and fringe-rural areas with 5G coverage) can access faster, more stable broadband than 4G fallback offers. On the other hand, users in rural areas outside FWA rollout zones may find 4G is the only option, and its performance may decline over time.

What This Means for Different User Groups

Urban users with 5G-capable devices: Likely to experience improved connectivity as 5G traffic separates from congested 4G. Those on 4G-only devices or older phones may see marginal speed declines during peak hours, but alternative operators and roaming options remain available.

Rural residents relying on 4G broadband: Face the greatest risk. If 4G maintenance is deprioritised in areas where 5G FWA is not yet deployed, speeds and reliability could decline. These users should consider strategies such as dual-SIM phones with backup operators, external antennas, or—where available—Starlink Residential packages (e.g., Starlink Residential 100 Mbps at approximately £35/month) as a long-term alternative to 4G fallback.

Mobile workers and roaming users: Should monitor their operator's 4G vs 5G coverage maps and consider multi-network strategies to ensure continuous fallback coverage, particularly in areas they frequent.

Forward-Looking Analysis: The 4G End-of-Life Question

A deeper question looms: when will UK operators formally retire 4G infrastructure? In other markets, carriers have begun 3G shutdowns (e.g., Vodafone UK is phasing out 3G by 2023–2024). A similar trajectory for 4G seems inevitable, though likely a decade away.

However, the timeline for 4G retirement is opaque. If operators begin aggressive 4G-to-5G migration before rural 5G and FWA coverage are truly universal, connectivity gaps could emerge. Rural users, IoT devices, older phones, and cost-conscious consumers on legacy tariffs could all be affected.

The regulatory challenge will be to ensure that any 4G retirement timeline is aligned with universal service obligations and that alternatives (5G, FWA, satellite) are genuinely available to affected users before legacy networks are switched off.

For now, 4G remains the de facto fallback and the lifeline for millions of UK users outside dense urban areas. Its performance under 5G-era competition and investment rebalancing deserves close monitoring—both by regulators and by users themselves.

Key Takeaways and Recommendations

  • 4G is under pressure but not failing: Median speeds remain acceptable in most areas, but variance during peak hours is increasing, indicating congestion.
  • Rural areas face the greatest risk: In single-operator zones outside FWA rollout areas, 4G is often the only connectivity option. Monitor speeds in your area using crowd-sourced tools and report issues to Ofcom if service degrades.
  • Operators are strategically shifting investment: This is rational from a business perspective, but may compromise 4G as a reliable fallback for non-urban users.
  • Diversify your connectivity: If you rely on 4G, consider dual-SIM phones with backup operators, external antennas, or alternative services like Starlink where available.
  • Watch the regulatory response: Ofcom's approach to 4G maintenance and rural connectivity will shape whether the transition to 5G is smooth or creates new digital divides.

The UK's mobile network is at an inflection point. 5G and FWA represent genuine progress in capacity and coverage, but the transition must not leave 4G users—particularly rural communities—behind. The next 12–24 months will be critical in determining whether that balance is maintained.