

This is 100% true on newer iphones and they explicitly tell you as much every time you power the phone off. It can be disabled, but only temporarily.
This brings up that as long as the battery is sealed in the phone you’re relying on trust in the software/hardware vendors to ensure the phone is actually “off” in the traditional sense and not “off” in one of these modern “standby mode” senses where it can boot faster or something (and therefore run some process that can do something else nefarious, though tbf probably not much)











Reply to another comment regarding phones not actually being “off” when off. iphones at least since the 11 are not off when off and keep the secure enclave powered to transmit phone location
This is 100% true on newer iphones and they explicitly tell you as much every time you power the phone off. It can be disabled, but only temporarily.
This brings up that as long as the battery is sealed in the phone you’re relying on trust in the software/hardware vendors to ensure the phone is actually “off” in the traditional sense and not “off” in one of these modern “standby mode” senses where it can boot faster or something (and therefore run some process that can do something else nefarious, though tbf probably not much)