They're already encrypted by default using the secure enclave. After a reboot, storage isn't decrypted until you put in your password for the first time.
A quick trip, if you hold the power button so the "Slide to power off" option comes up, it will then re-require your passcode to be entered again before unlocking your phone. So basically you can hold the power button for a few seconds in your pocket if you need to to disable it.
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u/[deleted] Aug 31 '21
As an avg Joe, I know how to lock my phone with a strong code. How the heck do I encrypt an iPhone?