British Prime Minister Boris Johnson has ordered all technology from China's Huawei to be stripped out of the UK's 5G network by 2027.
In a major U-turn, he also banned the purchase of any new 5G equipment from the Chinese companies from the end of this year, Sky News reports.
The government acknowledged the move would delay the roll-out of 5G in the UK by two to three years and increase costs by up to £2 billion.
Acting on the advice of the National Cyber Security Centre (NCSC), Johnson has accepted new US sanctions on Huawei are a "game changer" in relation to the impact of the firm's technology on the UK's national security.
Downing Street had previously allowed Huawei to have a role in the UK's 5G infrastructure - a decision that came little more than six months ago.
Johnson and senior ministers agreed to the removal of Huawei technology within the next seven years at a meeting of the National Security Council in Downing Street in the morning today.
Sky News' defence and security correspondent Alistair Bunkall said there were some "tense exchanges" during the NSC meeting.
An existing ban on Huawei's involvement in the most senstive parts of the UK's 5G networks - announced in January when the prime minister previously gave the go-ahead for the firm to build mobile infrastructure - remains in place.
Culture Secretary Oliver Dowden confirmed Tuesday's further action on Huawei in a statement to the House of Commons, as he announced the measures would be put into law by a forthcoming Telecoms Security Bill.
He told MPs: "By the time of the next election we will have implemented in law an irreversible path for the complete removal of Huawei equipment from our 5G networks.
"We have not taken this decision lightly and I must be frank about the decision's consequences for every constituency in this country; this will delay our roll-out of 5G."-Photo: Sky News