How to turn off iPhone 5 completely?

I've just got an iPhone 5 and your not supposed to have them at school so how do you turn them on silent and turn them off completely. I think I know how but just checking haha.

Hold top right button down for 5ish seconds and slide to power off.

The power/lock button on the top right, press & hold & Slide to shut down. Done. Do Not Disturb would silence the phone of all notifications without having to turn it off though.

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