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The government is right to "stand up" to China by denying Huawei access to the UK's 5G network, the chairman of the Commons defence committee has said.
Six months after agreeing the Chinese telecoms company could set up some of the network, ministers are to ban it from installing equipment.
Conservative MP Tobias Ellwood told the BBC it was important to prevent "control of data" by Beijing.
But Labour called the government's 5G policy a "car crash".
Huawei, which has repeatedly said it would not cause harm to any country., predicted the UK would now be pushed "into the digital slow lane", with higher bills for consumers.
In January, the government announced the company would be kept out of the sensitive core of the 5G network - including national intelligence - but be allowed involvement in up to 35% of other parts.
This prompted criticism from backbench Conservative MPs, who called Huawei an arm of the Chinese Communist Party and a risk to the UK. The US, with which the UK shares much of its intelligence, also applied diplomatic pressure for a rethink.
Under its revised plans, the government says Huawei will not be allowed to install any equipment for the 5G network from next year.
Culture Secretary Oliver Dowden said the company would be totally removed from it by 2027, telling the House of Commons: "There is of course no such thing as a perfectly secure network, but the responsibility of the government is to ensure that it is as secure as it possibly can be."
For Labour, shadow culture secretary Chi Onwurah said the government had been "incomprehensibly negligent" and had "refused to face reality" over Huawei.
She also asked whether UK security policy was "being led by the US" and said ministers had no "sustainable plan for the digital economy".
The government thought it had made its decision on Huawei earlier this year. It wanted to get on with delivering faster internet and thought Huawei was best placed to ensure speedy upgrades.
But since then the US has continued to apply pressure - with its decision to impose new sanctions on China a crucial factor.
Meanwhile, dozens of Tory backbenchers continued their opposition - and refused to fall in line. They will be scrutinising the detail of today's announcement. As well as a ban on Huawei's future involvement, many want current infrastructure run by the company removed.
However, ministers have to balance this with their commitments on faster broadband speeds. Telecoms chiefs have warned if things happen too fast without proper alternatives, we could see a reduction in some services and even blackouts.
SNP culture spokesman John Nicolson said it had been wrong in the first place to allow Huawei near the "nervous system" of the UK's telecoms network.
The US has claimed China could use Huawei to "spy, steal or attack" the UK - but the company denies this and its founder has said he would rather shut the company down than do anything to damage its clients.
Sanctions imposed in May by Washington have limited China's access to US chip technology, which prompted the UK's National Cyber Security Centre to launch a review of the use of Huawei.
Labour MP Chris Bryant told the Commons there was "unity" among MPs in opposition to the company's further involvement in 5G, saying: "I wish the government would listen to its own backbenchers."
Conservative MP and former Foreign Secretary Jeremy Hunt told the BBC News Channel the decision to ban Huawei from UK 5G should have been taken "a year ago".
He added that China wanted an 80% market share of global communications and he did not think that "future generations would look kindly on us if we became technologically dependent on another country".
But Mr Ellwood said he was "pleased" at the change of policy, adding: "This is a first opportunity for the government to stand up and say, 'No more.' It's the first indication that we are going to stand up."
He said global power struggles would become more "about control of data", adding: "If you control data, you control the way we live... It's right that we now stand up and have an adult conversation with China."
