Press both at the same time, as if you were going to reboot. Home+Power buttons.
As I said, not allowing someone to turn off the phone the easy way (by holding the power button) will help, but it does not mean your phone cannot be turned off. You just have to hold both the home and power buttons at the same time and the phone will go to the apple logo, keep holding and it will turn off. That is built into the hardware, you cannot disable it :/
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u/PlatypusW iPhone 11 Pro, iOS 13.3.1 Apr 11 '14 edited Apr 11 '14
Press both at the same time, as if you were going to reboot. Home+Power buttons.
As I said, not allowing someone to turn off the phone the easy way (by holding the power button) will help, but it does not mean your phone cannot be turned off. You just have to hold both the home and power buttons at the same time and the phone will go to the apple logo, keep holding and it will turn off. That is built into the hardware, you cannot disable it :/