UK telecoms regulator Ofcom has published a detailed report assessing real-world 4G performance from the country’s largest mobile operators. Between March and June this year, researchers carried out around 210,000 indoor and outdoor measurements to provide a practical view of what customers experience, rather than relying on theoretical maximum speeds often quoted in marketing materials.
Because 4G remains unavailable across much of the UK, testing focused on five major cities where 4G coverage has been established for longer: Birmingham, Edinburgh, Glasgow, London and Manchester. Ofcom compared operators using four clear metrics: download speed, upload speed, web browsing speed (page load time) and latency. These metrics reflect the most common ways people use mobile connections today—streaming and downloading content, uploading and sharing files, browsing the web, and real‑time interactions such as video calls and gaming.
Ofcom notes that operator networks continue to expand and improve, and the report represents a snapshot of performance during the test period. Further rounds of testing are planned and new findings will be published next year, enabling ongoing comparison and monitoring of service quality.
Download speeds
According to Ofcom’s measurements, the average 4G download speed across the UK was 15.1 Mbps, roughly double the measured average 3G speed of 6.1 Mbps. EE and O2 performed above the nationwide 4G average, with mean download speeds of 18.4 Mbps and 15.6 Mbps respectively. Vodafone’s average 4G download speed was close to the national mean at 14.4 Mbps.
Three lagged behind in 4G download performance, averaging 10.7 Mbps—barely above the national 3G average. That result should be viewed in context: Three was the final major operator to roll out 4G and remains the only network to include 4G access at no additional cost across its plans, which may influence investment priorities and rollout timing.
On 3G, EE and Vodafone led with similar average download speeds of 6.8 Mbps and 6.7 Mbps respectively, while O2 and Three recorded averages of 5.6 Mbps and 5.2 Mbps.
Average 4G and 3G download speeds by network
The full dataset in Ofcom’s report breaks down city-by-city and indoor/outdoor performance, but the national averages make clear that 4G offers substantially higher download capacity than 3G for typical users—particularly on networks that have invested earlier and more heavily in 4G infrastructure.
Upload speeds
Upload speeds on 4G showed a striking improvement over 3G across all networks. In many cases, upload throughput on 4G was multiple times faster than on 3G—on average 12.4 Mbps for 4G versus just 1.6 Mbps for 3G in the combined measurements. For users who regularly upload photos, videos or large files from mobile devices, this represents a significant practical benefit of moving to 4G.
On 4G, EE posted the highest average upload speed at 14.7 Mbps, followed by O2 at 13.0 Mbps. Vodafone and Three recorded solid 4G upload averages of 11.4 Mbps and 11.1 Mbps respectively. Interestingly, Three achieved the fastest average 3G upload speed at 1.7 Mbps, reflecting differences between operators’ legacy 3G network configurations.
Average 4G and 3G upload speed by network
Improved upload capacity on 4G is particularly important for business users and anyone who relies on cloud services, video conferencing, social media uploads or live streaming from mobile devices. The measurements underline that 4G typically delivers a much more responsive and capable uplink than 3G.
Web browsing
Many people use mobile devices as their primary way to browse the web, and page load time is a direct measure of perceived responsiveness. Ofcom’s tests show that, on average, web pages load in around 0.78 seconds on 4G compared with about 1.06 seconds on 3G—providing noticeably snappier browsing on 4G.
Three delivered the fastest average page-load times, with 0.62 seconds on 4G and 0.93 seconds on 3G. EE followed closely with an average of 0.76 seconds on 4G and 1.05 seconds on 3G. O2 and Vodafone produced similar 4G browsing times of around 0.82 seconds. Among providers, O2’s 3G browsing time was the slowest at approximately 1.17 seconds, which contributed to a wider gap between its 3G and 4G performance in this metric.
Average time taken to load a web page by network (lower is better)
Faster web browsing on 4G improves everyday mobile usability—from quick news checks to smoother navigation of web apps—making the overall user experience feel more immediate and reliable.
Latency
Latency, the time it takes for data to travel between a device and the network, is critical for real‑time applications such as video calls, live streaming and mobile gaming. The tests show that 4G generally offers lower latency than 3G, making it more responsive for interactive tasks.
Three recorded the lowest latency on both 4G and 3G (47.6 ms and 53.8 ms respectively), which helps explain its strong browsing and interactive performance. O2 had the highest measured latency—particularly on 3G—at around 86.4 ms. Aside from these differences, most networks produced similar latency figures, indicating broadly comparable responsiveness for most users.
Average 4G and 3G latency by network (lower is better)
Lower latency on 4G supports better performance for video calls, real-time collaboration and gaming, and the results suggest that users switching to 4G can expect a noticeably more responsive connection for these activities.
Conclusion
Overall, Ofcom’s measurements reinforce that 4G is a meaningful upgrade over 3G for the typical user: download and upload speeds are higher, web browsing is faster, and latency is lower. While Three underperformed on 4G download speed, it led across several other categories—an interesting outcome given its later rollout and the decision not to charge customers extra for 4G access. EE and O2 produced strong download and upload numbers, and Vodafone’s results were broadly in line with national averages.
The findings provide a practical, real-world benchmark for consumers considering whether to move to 4G and offer a useful comparator of operator performance in major UK cities. As networks continue to evolve and Ofcom publishes further testing, these comparisons will help track progress and ensure operators maintain quality as user demand and network capabilities increase.
Do you feel that 4G services are meeting your personal expectations? Let us know in the comments.