Three / VodafoneThree
Independent guide to Three UK — now part of VodafoneThree after the June 2025 merger with Vodafone UK. Speed caps, Go Roam, rewards, and what the £11B investment means for customers.
Three launched on 3 March 2003 — the date deliberately chosen to be 03/03/03 — as the UK's first 100% 3G mobile network, owned by CK Hutchison Holdings of Hong Kong. The company's founding vision was genuinely radical for 2003: build a data-first mobile network at a time when virtually all UK mobile phones were used almost exclusively for calls and texts. Early growth was painfully slow — initial handsets were expensive, 3G coverage was thin outside major cities, and video calling (the flagship feature at launch) failed to capture consumer imagination. Three nearly went bankrupt in its first five years.
But Three's persistence paid off. As smartphones arrived and mobile data use exploded after 2007, Three's data-forward infrastructure became an enormous competitive advantage. Three consistently offered the most generous data allowances at the lowest prices of any major UK network — attracting the heaviest data users and building a loyal customer base. Three also pioneered inclusive international data roaming from the early days, offering free roaming in partner networks globally long before competitors, eventually formalised as the Go Roam programme.
Vodafone UK and Three UK announced their proposed merger in June 2023. After an 18-month review by the Competition and Markets Authority — the most detailed UK telecoms merger investigation in history — the CMA approved the deal in December 2024 on condition of binding commitments: a £11 billion 10-year network investment plan, consumer price protections for existing customers, a minimum speed and quality guarantee on the merged network, and a requirement to support at least one low-cost "Functional Equivalent" network on the merged infrastructure for budget providers.
The merger completed on 31 May 2025, creating VodafoneThree — a 51/49 joint venture between Vodafone Group (majority) and CK Hutchison (minority). The combined business has 28.8 million mobile customers, making it the UK's largest mobile operator by subscriber count. In May 2026, Vodafone Group announced a £4.3 billion cash buyout of CK Hutchison's 49% stake — subject to regulatory approval, this would make VodafoneThree wholly owned by Vodafone Group, completing the full merger.
The network investment commitment covers 2025–2034 and targets 99% 5G Standalone population coverage by 2030 and 99.95% by 2034. Year one (FY2026) committed £1.3 billion in capital expenditure. The plan uses Multi-Operator Core Network (MOCN) technology allowing both Three and Vodafone customers to automatically connect to whichever merged mast provides the strongest signal in any given location. Cost and capital synergies of £700 million per year are targeted by year five (FY2030).
Three SIM Only plans are available on 1-month rolling, 12-month, and 24-month terms. The plan tier system determines roaming access: Lite plans (no Go Roam), Value plans (Go Roam in Europe — 49 destinations), and Complete plans (Go Roam Around the World + Around the World Extra — 163 total destinations). Unlimited data plans are typically the most affordable unlimited mobile plans of any UK network.
Go Roam is Three's international roaming programme allowing customers on qualifying plans to use their UK data, calls, and texts allowance in foreign countries as if at home, at no daily charge. Go Roam in Europe covers all 49 EU and associated European destinations. Go Roam Around the World adds 22 major global destinations including the USA, Australia, New Zealand, Brazil, Hong Kong, and Singapore. Go Roam Around the World Extra adds over 90 further countries including Canada, China, India, Japan, UAE, Saudi Arabia, South Africa, Kenya, Pakistan, Bangladesh, Morocco, and dozens more — bringing the total to 163 worldwide destinations on Complete plans. A fair-use cap of 12GB data, 3,000 minutes, and 5,000 texts per month applies when roaming internationally.
Three+ is a free customer loyalty app available to all Three Pay Monthly, PAYG (with qualifying top-up history), Home Broadband, and Business customers. In 2026, standing offers typically include: a free £1 barista-made coffee every week at PAUL bakeries, Wenzels, Cooplands, Caffè Nero, and Cineworld café — plus at over 1,400 local independent coffee shops across the UK (saving up to £4.20 per week, £218/year). Three+ also offers £3 weekend cinema tickets at Cineworld (Friday to Sunday); £5 off restaurant and takeaway orders; Nike, HelloFresh, Uber, Bloom and Wild discounts; and presale access to concerts and events via Ticketmaster. Three+ won the Uswitch Best Mobile Network for Perks award in 2026.