Groups linked to China's military and intelligence service have targeted the Smartphones of prominent Americans and burrowed deep into US telecommunication networks, leaving American interests open to snooping and cyberattack. Now investigators at the cybersecurity firm iVerify learned that Chinese hackers can also infiltrate a Smartphone without a single click from the user. Foreign hackers have increasingly identified Smartphones, other mobile devices and the apps they use as a weak link in US cyber-defenses.