Thanks to Citizen Lab and Lookout; also see This malware sold to governments could help them spy on iPhones, researchers say (The Washington Post)
"Investigators discovered that a company called the NSO Group, an Israeli outfit that sells software that invisibly tracks a target’s mobile phone, was responsible for the intrusions. The NSO Group’s software can read text messages and emails and track calls and contacts. It can even record sounds, collect passwords and trace the whereabouts of the phone user.IPhone Users Urged to Update Software After Security Flaws Are Found - The New York Times
In response, Apple on Thursday released a patched version of its mobile software, iOS 9.3.5. Users can get the patch through a normal software update."