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Vodafone UK and Three UK combined to form VodafoneThree, reducing the UK’s nationwide mobile network operators from four to three. The deal was announced on 14 June 2023, cleared by the Competition and Markets Authority (CMA) with binding conditions on 5 December 2024, and completed on 31 May 2025. Vodafone initially owned 51% of the joint venture; after buying CK Hutchison’s remaining 49% in 2026, Vodafone became its sole owner. The parent companies did not merge globally: CK Hutchison owned Three UK, the business that joined Vodafone UK.
What was the Vodafone–Three deal?
The transaction combined the UK operating businesses Vodafone UK and Three UK in a new company, initially known as MergeCo and later named VodafoneThree. Vodafone Group contributed Vodafone UK; Three UK was owned by CK Hutchison Group Telecom Holdings, a subsidiary of CK Hutchison. The original structure was a joint venture, not a global merger of Vodafone and CK Hutchison: Vodafone held 51% and CK Hutchison 49% when the deal completed. Vodafone’s announcement of the deal set out that structure.
Vodafone described the combined business as the UK’s largest mobile operator. That is the company’s characterization; the central market change is clearer: two of the country’s four mobile network operators became one. The other nationwide network operators are BT/EE and Virgin Media O2.
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The companies argued that Vodafone UK and Three UK needed greater scale to compete with EE and Virgin Media O2 and to fund the next generation of mobile infrastructure. Vodafone announced an £11 billion network investment plan and projected more than £700 million in annual cost and capital-expenditure synergies by the fifth full year after completion. These were company plans and forecasts, not proof that the money has all been spent or that the projected savings have been achieved.
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The companies said a larger network could accelerate 5G deployment and support fixed wireless access, which uses a mobile network to provide home or business broadband. The policy case for the merger therefore rested on a trade-off: could investment and a stronger third competitor deliver enough benefit to offset the loss of a fourth independent network?
Why did the CMA scrutinize the merger?
Before the deal, Vodafone and Three competed as separate network operators. Combining them meant fewer independent networks putting pressure on prices, data allowances, service quality, and investment decisions. The CMA warned that the merger could substantially lessen competition, potentially leading to higher prices, smaller data allowances, or lower service quality. It also said the harm could affect tens of millions of customers and weigh particularly heavily on people least able to afford mobile service.
There was a potential upside, too. A combined operator might have more capacity and investment to improve coverage and service, including 5G. The question was not simply whether fewer operators are always bad or whether more investment is always good: it was whether enforceable protections and the expected network gains could balance the competitive risk. The CMA’s investigation summary explains both sides of its assessment.
Key dates: announcement, approval, completion and buyout
- 14 June 2023: Vodafone and CK Hutchison announced the proposed combination of Vodafone UK and Three UK.
- 26 January 2024: The CMA opened its formal investigation.
- 22 March 2024: The CMA said the merger might substantially lessen competition; it referred the case for an in-depth Phase 2 investigation on 4 April.
- September 2024: The CMA published provisional findings setting out its concerns.
- 5 November 2024: The CMA said the deal could proceed if the parties gave legally binding commitments to address those concerns.
- 5 December 2024: The CMA cleared the merger subject to those commitments.
- 31 May 2025: The Vodafone UK–Three UK merger completed, forming VodafoneThree.
- 5 May 2026: Vodafone agreed to buy CK Hutchison’s remaining 49% interest for £4.3 billion (€4.9 billion).
- By 18 August 2026: Vodafone had announced completion of the buyout and ownership of 100% of VodafoneThree.
The CMA case page records the regulatory process. Vodafone’s completion announcement confirms the May 2025 date, while its buyout completion announcement describes the later change in ownership.
What conditions did the CMA impose?
The CMA did not give unconditional clearance. Its legally binding commitments were designed to protect customers and wholesale competitors while the network was combined. They included:
- An eight-year joint network plan covering upgrades and integration.
- Three years of protections on selected retail tariffs and data plans. These are limited protections, not a freeze on every price or plan.
- Three years of pre-set prices and terms for certain wholesale services, intended to protect mobile virtual network operators (MVNOs) that use the network.
- Progress reporting and oversight involving the CMA and Ofcom.
The scope matters: a customer should not read the remedy as a guarantee that every Vodafone or Three price would remain unchanged for three years, let alone indefinitely. Details of the commitments and the case’s closure are in the CMA investigation overview.
What changed for customers?
The corporate merger did not automatically mean that Vodafone and Three became one consumer brand, or that every customer needed a new SIM, handset, tariff, or roaming arrangement. VodafoneThree said its multi-brand strategy would continue, and Vodafone’s 2026 announcement of sole ownership said there would be no change to that strategy. A change in the company behind a service is distinct from a change to an individual customer’s contract or plan.
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For MVNO customers, the relevant issue is the wholesale arrangement between their provider and its host network, not just the brand on the SIM. The CMA’s wholesale commitments were intended to protect terms for certain services for a limited period. MVNOs can continue to create retail choice even though the number of physical nationwide networks has fallen from four to three, but their offers and network access vary by provider.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do early network results show?
A one-year report commissioned by Vodafone and prepared by Frontier Economics describes early network improvements after completion. It says Vodafone 1800 MHz spectrum had been deployed on nearly 15,000 legacy Three sites and reports an average 4G speed increase of about 20% for more than seven million customers. By February 2026, it says reciprocal access to sites had removed more than 16,500 square kilometres of “not-spots.”
The same report gives these changes between May 2025 and March 2026:
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| Measure | Vodafone | Three |
|---|---|---|
| 5G population coverage | 59% to 64% | 65% to 72% |
| Average 5G download speed | 172 Mbps to 237 Mbps | 313 Mbps to 341 Mbps |
These figures are from a Vodafone-commissioned Frontier Economics report, not a regulator’s independent audit of every customer’s experience. They offer evidence of reported early progress, but should be read with that source and scope in mind. Coverage and speed statistics do not guarantee the same result for each person or place.
What did Vodafone’s 2026 buyout change?
Vodafone’s purchase of CK Hutchison’s 49% stake was a second transaction, separate from the original 2023–2025 joint venture. The merger had already reduced the number of independent UK network operators when it completed in 2025. The 2026 buyout changed who owned VodafoneThree: Vodafone moved from 51% ownership to 100%. Vodafone said sole ownership would enable faster decisions and delivery of the network plan; that is its stated rationale, not a demonstrated consumer outcome.
The UK government also varied the national-security final order in connection with the ownership change. The order addresses risks relating to sensitive government services, network and data security, cyber security, personnel, and physical security. It is a separate layer of oversight from the CMA’s competition review. The government’s notice of variation sets out that national-security context.
Who could benefit, and what remains uncertain?
- Customers could benefit if the network plan produces better coverage, capacity, and reliability. They also face the risk that reduced network competition weakens pressure on prices and service after temporary protections expire.
- MVNOs retain a route to compete on price and service, but depend on wholesale access and terms. The CMA’s protections are time-limited and apply to specified services.
- Vodafone and Three gain the scale and integration opportunity they said they needed. Delivering projected synergies and network improvements remains a matter of execution, not an automatic effect of the corporate structure.
- EE and Virgin Media O2 face a larger rival, which could intensify competition if VodafoneThree invests and competes effectively. Whether that offsets the loss of one independent network is the central unresolved market question.
The eight-year network commitment makes the effect a long-term question, not one settled by the announcement, regulatory clearance, or first-year performance claims. The meaningful test is whether improved network service and a stronger competitor endure without leaving customers with less choice or weaker price pressure.
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