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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.
*WARNING* may cause damage to your phone. use caution and monitor your phone while charging. this vid is for information im not forcing you to do anything and have not had any problems myself....WARNING* may cause damage to your phone. use caution and monitor your phone while charging. this vid is for information im not forcing you to do anything and have not had any problems myself....