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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.
Charging. You can maximize your cell phone's battery by limiting your number of charges. Charging a phone when it is at half power, as opposed to a phone with depleted power, trains a battery to hold only half of a charge.If possible, only charge the phone when its power has been completely depleted.ou can maximize your cell phone's battery by limiting your number of charges. Charging a phone when it is at half power, as opposed to a phone with depleted power, trains a battery to hold only half of a charge.