by DAVID H. FREEDMAN
TELECOMMUNICATIONS
At the end of March, mobile phone carrier China Unicom broadcast a 360-degree, 3D view of the Chongqing International Marathon that put viewers smack in the middle of the 30,000-strong scrum of runners. The images were four times sharper than the highest-resolution content available from Netflix. The live stream—billions of digital bits of data per second—was 20 times faster than current cellphone networks built with 4G technology can manage. China Unicom was demonstrating 5G technology, the next big leap for mobile networks, built by Huawei, the Chinese telecom giant that President Donald Trump loves to hate.