It was an interesting read, moral to me is not to use Cell Phones for anything illegal. If you do not control the keys, you might as well not bother with encryption.
Even if you control the keys, it does not protect you from vulnerabilities somewhere in the stack. Stuff like thumbnail generation provided by the OS has been used by cyber-criminals in the past to compromise phones by sending MMSes or even third-party messenger apps, and I'd take a guess and bet that at least the Five Eyes government agencies all have a sizeable cache of baseband vulnerabilities.
Technology simply has become far too complex to be reasonably secure, even if you have the financial firepower of being Apple, Sony, Microsoft, Nintendo or Amazon.
If it installs updates without requiring you to specify the desired updates explicitly (i.e. by cryptographic hash), it should not be considered "your" device from a security perspective.
Technology simply has become far too complex to be reasonably secure, even if you have the financial firepower of being Apple, Sony, Microsoft, Nintendo or Amazon.