Can you charge an iphone 4 while its off?

My daughters iphone 4 has to be charged. Can i charge it off, or does it have to be on?

Yes.

Once it is plugged in to charge it would turn on. If the battery is dead it would take a while but would eventually turn on & of course it can be plugged in while on & charge.

Either would work. It would charge faster off.

Yes. You can.

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