The decision announced Tuesday represents a U-turn for the British government which had previously decided to allow Huawei to access parts of the planned new 5G network.
Conspiracy theorists believe 5G is to blame for the rapid spread of COVID-19. Are they right?
So what are they worried about?
Industry leaders are touting 5G as the next mobile revolution, with experts saying the network could be rolled out as early as next year — but what are the health risks, if any?
Euronews' Jeremy Wilks and Emma Beswick take a tour of the Mobile World Congress in Barcelona