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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.
I never turn mine off, so didn't notice the change. In any case, the battery is not being discharged if the phone is on while charging. Some power from the charger is used to run the phone; the rest is used to charge the battery. Level 2 (325 points). You can charge it turned on or off.You can do it with any iPhone in any country. Level 4 (1,725 points). Sometimes I turn my iphone off completely. Before charging, I'm around 40% then i turn it off while charging, and when I turn it back on in the morning, it reads 100% and is fully charged.So technically it should still charge when turned off.ou can do it with any iPhone in any country. Level 4 (1,725 points). Sometimes I turn my iphone off completely. Before charging, I'm around 40% then i turn it off while charging, and when I turn it back on in the morning, it reads 100% and is fully charged. So technically it should still charge when turned off.