China cybersecurity hacking smartphones.

Hackers tied to China’s government have tried repeatedly to access the phones of prominent Americans, part of Beijing’s sprawling cyberespionage efforts. Smartphones and other mobile devices present significant national security and cybersecurity risks, as foreign government hackers exploit vulnerabilities in mobile networks and apps to spy on people and steal secrets. And people’s careless use of mobile devices to share sensitive information is another concern. National security experts say that mobile security hasn’t kept up as mobile devices and networks have proliferated, making them a significant vulnerability in the nation’s cyber defenses.