power off iPhone SE
Under what circumstances should I turn off my iPhone se?
iPhone SE (Gen 3)
Question marked as
There are no specific suggestions about when to turn off an iPhone (instead of turning it off completely, you can use the Airplane mode, the mute switch, the Focus Do Not Disturb options, etc), but you might need to "restart" your device, since this procedure often solves minor glitches.
These are the instructions: Restart your iPhone - Apple Support
Obviously you can turn it off whenever you want.
Regards
Giulio