If the plug of the phone charger falls into the water, it is best not to continue using it, because the water can cause a short circuit, which may be dangerous to the phone and people. Even if the plug looks dry, there may be a problem. It is best to dry the plug thoroughly or replace it with a new one. Do not plug your phone into an outlet to charge it without checking or replacing the plug, to avoid damage to the device or the risk of electric shock.