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No, not necessarily, but it can cause a minor issue. iPhones use a Lithium-Ion battery for its power, using while it's charging won't necessarily ruin the battery, but if you're using the phone while the battery is in the charging process, it can cause the phone to think it has more power than it actually has.
Does the iPhone4 have to be powered on while charging? I have a habit of completely turning off my phone (currently a blackberry) overnight when charging and plan to do the same with my iPhone If it's the same version as AT&T's the answer would be no.You can turn it off and plug the charger in and it will turn on to sleep mode and then start charging.Originally Posted by curtisinoc. I've read somewhere that you can't charge the iPhone4 while it's powered off.oes the iPhone4 have to be powered on while charging? I have a habit of completely turning off my phone (currently a blackberry) overnight when charging and plan to do the same with my iPhone If it's the same version as AT&T's the answer would be no.