Jansen said BT was in talks with the British government to explain the potential ramifications of the decisions it may soon take, and hoped "common sense would prevail" in the end "and we will head the right direction here".
Mr Jansen also said that removing all Huawei products from the network would take about 10 years, while taking it out of the 5G infrastructure could be completed in five to seven years.
Britain had decided in January to let Chinese tech giant Huawei have a limited role supplying new high-speed network equipment to wireless carriers, ignoring the USA government's warnings that it would sever intelligence sharing if the company was not banned. "Secondly the security and safety in the short-term could be put at risk - this is really critical here".
While Huawei had a market cap of 35 percent, but since it is a high risk vendor, it can not be allowed to work in core areas.
"If you get into a situation where [replacing] things need to go very, very fast, then you're into a situation where potentially service for 24 million BT group mobile customers is put into question - outages would be possible". Operators already had to cap Huawei's role in 5G at 35% by 2023.
The perceived security risk posed by the Chinese company has led to calls, from at home and overseas, for Johnson to ban it outright.
"There is huge opportunity for the economy, for the country and for all of us from 5G and from full fiber to the home and if you accelerate the rip out obviously you're not building either so we've got to understand all those implications and try and steer a course and find the right balance to managing this complicated issue". Justice Secretary Robert Buckland said on Monday the "priority" in the decision would be national security.
Asked about Huawei in June, Johnson said he would protect critical infrastructure from "hostile state vendors". "It's too early to assess the long-term impact of the USA restrictions", Huawei UK had tweeted.
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