A sign advertising 5G mobile telecommunication in a shop in London. Britain is hoping to negotiate a comprehensive free-trade agreement with the United States after Brexit, but a number of thorny issues stand in the way. Justin Tallis / AFP
A sign advertising 5G mobile telecommunication in a shop in London. Britain is hoping to negotiate a comprehensive free-trade agreement with the United States after Brexit, but a number of thorny issuShow more

In the 5G era, China has taken the lead as the West has failed to keep up