But BT said in a statement this week that it was removing equipment made by the Chinese company, which was founded by a former Chinese military officer.
"We're applying these same principles to our current request for proposal for 5G core infrastructure". As a result, Huawei have not been included in vendor selection for our 5G core.
It also follows a warning from the head of Britain's MI6 foreign intelligence service about the potential threat Huawei poses to national and corporate security.
BT has barred Huawei's equipment from being used in its core 5G mobile network when it goes online in the United Kingdom, the company has confirmed, amid security concerns.
BT started removing Huawei equipment from its network core after this acquisition, it said in an email to CNET.
BT bought EE for £12.5bn in 2016, which used Huawei equipment in its core 3G and 4G mobile networks at the time, but has since been working on a programme to remove the hardware. As well as the obvious eavesdropping worries, it is feared that the Chinese government could force Huawei to make equipment / components that could be remotely disabled or caused to fail.
Huawei told The Reg it had "been working with BT for nearly 15 years".
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"We need to decide the extent to which we are going to be comfortable with Chinese ownership of these technologies and these platforms in an environment where some of our allies have taken a very definite position", he said.
It said the process was to bring the EE networks into line with the rest of its business rather than a change of policy.
Concerns about Chinese involvement in sensitive areas such as telecoms began to grow after a recent report to US congress by the US-China Economic and Security Review Commission suggested the Chinese government "exerts strong influence over its firms".
Fellow UK mobile carrier Three last month also announced that it is working with Huawei on a 5G home broadband demo in London.
News of BT's shafting of Huawei comes just weeks after the Wall Street Journal reported that the USA government is pressuring foreign allies to ditch networking from Huawei.
In 2010, the British government, Huawei and telecom operators, including BT, established the Huawei Cyber Security Evaluation Centre (HCSEC) Oversight Board, based in Banbury.