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The merger between Vodafone Group PLC and Three UK has received clearance to form the country’s largest mobile operator, provided the companies cap prices and commit to significant 5G infrastructure investments, Britain's Competition and Markets Authority (CMA) announced Thursday.

The deal, which will create a telecoms giant serving 27 million customers, hinges on legally binding commitments to invest billions of pounds into a unified 5G network and cap certain mobile tariffs for at least three years.

The CMA acknowledged that without these interventions, the merger could result in a “substantial lessening of competition” in the market. Failure to meet the proposed terms could see the merger prohibited, the regulator warned.

A Boost for Competition or a Risk?

Stuart McIntosh, chair of the independent inquiry group investigating the deal, expressed confidence in the merger’s potential benefits.

“This merger is likely to enhance competition in the U.K.’s mobile phone sector if Vodafone and Three adhere to their proposed remedies,” McIntosh said.

Oversight of the merger’s conditions will be shared between the CMA and communications regulator Ofcom, ensuring commitments are met to expand 5G capability while preserving competition.

The CMA said its measures aim to address concerns about reduced market competition while driving improvements in coverage, speed, and reliability.

A Telecoms Shake-Up

The £16.5 billion ($21 billion) merger is expected to close by mid-2025, with Vodafone holding a 51% stake and Hong Kong-based CK Hutchison, Three UK’s parent company, retaining 49%. Vodafone has pledged to invest £11 billion in network upgrades during the first 12 months post-merger, without passing costs onto consumers.

Margherita Della Valle, Vodafone's CEO, described the CMA’s decision as a transformative moment for the industry.

“Approval by the CMA releases the handbrake on the telecoms sector,” Della Valle said. “Consumers and businesses will benefit from wider coverage, faster speeds, and better connections.”

CK Hutchison co-managing director Canning Fok pledged full support for the merged company’s ambitious investment plans, calling them the “cornerstone” of CMA approval.

Legal and Regulatory Context

The merger reduces the U.K.’s major network operators from four to three — a shift Alex Haffner, a competition partner at Fladgate, said reflects CMA pragmatism.

“Unlike previous European ‘4-3’ mobile network mergers, this deal was approved solely on behavioral remedies,” Haffner noted, pointing to the CMA’s confidence in the long-term benefits for consumers.