UK mobile operator Three has announced a planned investment of £2 billion in 5G infrastructure, stating the network will become so reliable and capable that many households could eventually replace their fixed-line broadband connections with 5G service.
Three has assembled one of the largest 5G spectrum portfolios in the UK and upgraded its network with new radio equipment to support widespread 5G deployment. The company has also linked 20 data centres using high-capacity dark fibre to ensure the backhaul needed for increased traffic and low-latency services.
“This is a major investment in the UK’s digital infrastructure,” said Dave Dyson, CEO of Three UK. “Consumers demand more data than ever before, and 5G unlocks significant capabilities to meet that demand.”
Ofcom predicts that mobile data traffic by 2025 could be between 12 and 47 times higher than 2014 levels. Three’s customers are particularly data-hungry, reportedly consuming around 3.5 times more data per month than the average user.
“We have always led on mobile data and 5G is another game-changer. Often described as wireless fibre, 5G offers a huge increase in capacity and ultra-low latency. That combination opens up new possibilities for home broadband and industrial use cases, while supporting the rapid growth in mobile data usage.
We have been planning our 5G strategy for many years and are well positioned to lead this next generation of mobile technology. These investments are important building blocks to deliver the best end-to-end data experience for our customers.”
Three has a history of early mobile data innovation in the UK: it was the first operator to launch commercial 3G services in 2003 and later introduced offerings like all-you-can-eat data plans, video calling, and extensive free roaming.
The company has expressed support for the UK government’s ambition to accelerate 5G rollout and said it is collaborating with the Department for Digital, Culture, Media and Sport (DCMS) to remove barriers that slow deployment. One area Three supports is improving access to publicly owned sites for equipment installation.
As part of its 5G preparations, Three has completed several key initiatives:
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Acquired a leading portfolio of 5G spectrum across the UK.
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Signed agreements to roll out new cell site technology to prepare major urban areas for 5G devices while also enhancing 4G performance.
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Built a high-capacity dark fibre network connecting 20 new, energy-efficient and secure data centres.
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Deployed a cloud-native, 5G-ready core network across those new data centres. At launch the core will support an initial capacity of 1.2 TB/s—roughly three times its previous capacity—with the ability to scale further cost-effectively and rapidly.
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Implemented carrier aggregation on 2,500 high-traffic sites to improve user speeds in the busiest areas.
Dyson argues that 5G’s improved speed, capacity and latency will make it a viable replacement for fixed-line home broadband for many households, potentially lowering costs for consumers who opt for mobile-based broadband plans.
With 4G, a full broadband replacement has been impractical for most users due to limited capacity and higher latency. While some people already use 4G for basic internet tasks—particularly in rural areas—5G makes higher-demand applications such as cloud gaming and virtual reality far more feasible.
Three acquired Relish last year and currently offers a 4G unlimited home broadband product in London. At launch, the company managed sign-ups carefully to avoid service degradation. Dyson says those concerns are mitigated by 5G’s greater capacity and architecture.
Mobile operators, including Three, argue that 5G network rollouts can be a more cost-effective alternative to deploying full-fibre connections directly to every home. The UK government’s current target is nationwide full-fibre availability by 2033.
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