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Tens of millions of mobile phone users could end up paying more if the merger between Vodafone and Three goes ahead, the competition watchdog has warned.
The deal would create the UK's biggest mobile network and could also improve network quality, the Competition and Markets Authority (CMA) said.
A better network?
But claims of providing a faster 5g network are "overstated", it added, and the new combined network would not "necessarily have the incentive" to follow through on its investment and improvement plan.
Customers may have to pay more for services they don't value, the regulator said.
Of particular concern was the possible effect on those least able to afford higher bills.
A worry was some could get a reduced service like smaller data packages in phone contracts.
What next?
It has provisionally concluded the merger would result in "substantial lessening of competition" in the UK.
The CMA will now consider how the companies could address those concerns. If they aren't met the CMA could block the entire deal.
Possible ways of alleviating those competition issues include making legally binding investment commitments overseen by communications regulator Ofcom and implementing measures to protect customers.
A final decision will be made in early December.
The regulator had announced an in-depth investigation in April over fears the merger could "result in a substantial lessening of competition".
The proposed £15bn merger, announced last year, would bring 27 million customers together under a single provider.
What do Vodafone and Three say?
Both companies disagreed with the concerns raised by the CMA but they could be addressed.
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