Telecoms providers must stop installing Huawei equipment in the UK's 5G mobile network from September, the government has said.
The announcement came ahead of a law being unveiled this afternoon, which bans the Chinese firm from the network.
Digital Secretary Oliver Dowden said he was pushing for the "complete removal of high-risk vendors" from 5G networks.
The new deadline falls earlier than expected, although maintaining old equipment will still be allowed.
Networks will now have to adjust their schedules for deployment of the reserves of Huawei 5G kit they have built up.
Previously, BT's EE division, Vodafone and Three UK would have had until 2027 to install any such equipment acquired before the end of this year - when a purchase ban comes into effect.
Huawei told the BBC it would not be commenting on the announcement.
Big fines
Attempts to rid Huawei from the network have been ongoing for more than a year.
But the new Telecommunications Security Bill is the first step in enshrining such bans in law, and offers details of exactly how it will work - if it is passed by Parliament.
It will give government national security powers, allowing them to give instructions to big telecoms companies, such as BT, about how they use so-called "high-risk" vendors like Huawei, if at all.
It also threatens telecoms firms with hefty fines if they fail to comply with the new, higher security standards. They could total 10% of turnover or more than £100,000 per day.
Mr Dowden said that the "new and unprecedented powers" would allow government to "identify and ban telecoms equipment which poses a threat to our national security".
"We are also publishing a new strategy to make sure we are never again dependent on a handful of telecoms vendors for the smooth and secure running of our networks," he said.
The ban on installations will be accompanied by measures to encourage more suppliers to enter the market and replace Huawei, and the development of new technologies that open up the market.
There were fears firms might stockpile new kit and install it later, despite a ban on buying it from the end of 2020.
Under the new strategy, the government will spend an initial £250m which will involve setting up a National Telecoms Lab research facility as well as investing in open radio technology.
"Our plans will spark a wave of innovation in the design of our future mobile networks," Mr Dowden added.
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