Starting this fall, you'll be able to really secure your iPhone with Apple's new "Lockdown Mode."
It's not a feature for everyone but if you're a public figure, like a journalist or celeb who could be the target of sophisticated hacker attacks it could come in handy.
It's designed to keep sophisticated spyware from running on your phone. But chances are, you'll never need it and thank goodness, because Lockdown Mode will restrict a lot of functionality, including message attachments and receiving Facetime calls.
Check out this explanation for more.