How Secure Can a Specific Model of Phone Be?

CNN's John Sutter says he has faith in modern encryption. But there is a separate unrelated issue, which is how secure can a particular company make a particular model of phone? "There have been tons of security exploits with Apple stuff and Android phones over the years" 'I don't really want to get into some of the details of this particular case,' said Sutter.'But I'll just say that like it came up because it had some particular security flaws that the FBI wanted to exploit'