BT's £12.5 billion takeover of mobile network provider EE has been given final approval by the competition regulators.
In its final decision, the CMA said the takeover was unlikely to significantly impact on competition in the market. EE is the UK's largest mobile network, while BT is the country's largest fixed-line telecoms firm.
John Wotton of the CMA said: "The evidence does not show that this merger is likely to cause significant harm to competition or the interests of consumers."
EE will continue to operate as a separate company, with Marc Allera named as the mobile firm's CEO once the deal is complete.
BT chief executive Gavin Patterson said: "The combined BT and EE will be a digital champion for the UK, providing high levels of investment and driving innovation in a highly competitive market. I have no doubt that consumers, businesses and communities will benefit as we combine the power of fibre broadband with the convenience of leading edge mobile services. I look forward to welcoming EE into the BT family."
Some of BT's rivals have called for its OpenReach company to be spun-off to ensure fair competition in the market.