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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.
Guzelian. Damage: The phone caught fire while charging, leaving Alan shocked. However, Mr Brown says he was asked to sign a disclaimer to agree that he is happy with the new phone as a 'final settlement' for the incident. He added: I am very annoyed at Samsung as at the time I though it was just my phone.