The European Union has paused 5G rollout but is pressing ahead with its plans to develop it across the bloc with ongoing risk-based assessments.
So what are they worried about?
5G will enable users to download whole movies in seconds but will require many more antennas, raising health fears.
She said Europe needs to work together to address national security concerns over 5G networks.
Euronews asks national security and China experts about the Huawei security concerns.
PM Theresa May fired Defense Secretary Gavin Williamson after an investigation into government leaks about China's Huawei and Britain's new 5G network
UK police said that a leak from a National Security Council meeting does not amount to a criminal offence,
British culture minister Jeremy Wright did not rule out a criminal investigation after press leaked China's Huawei Technologies' involvement in 5G network supply chains.
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?
It comes after the US embassy in Berlin said the use of untrusted vendors by allies in their 5G mobile networks could jeopardise future sharing of intelligence.
Euronews' Jeremy Wilks and Emma Beswick take a tour of the Mobile World Congress in Barcelona
The world's biggest mobile tech show is underway in Barcelona and foldable phones are one of the main talking points.