Turn off the phone for how long? And how would one even know if they’re being attacked? Turning off the phone is not an easy option for investigative journalists and activists, especially in today’s world where communicating with people in different geographical locations may be necessary.

Right out of the box, smartphones are more secure than mainstream personal computers (running Windows, macOS or Linux) that are connected to the Internet.

Because people generally do things that require being able to use a phone?

Politicians, executives, and celebrities are under constant attack. You can't just expect they halt communication.