Can shower steam cause water damage to an iPhone?

Well my sister actually dropped her phone in our toilet, but won't tell my mom that. She has an iPhone 4. Anyways she told my mom it just shut down on her and my mom I guess looked at the little water damage sensor which showed water damage. So my mom went ahead and called the insurance people and the insurance guy says not to keep your phone in the bathroom while showing or the steam can mess up your phone. So she thinks that's what it is. I think it's possible, but does this really happen? Lol i've just never heard of this actually happening to someone's phone.

Steam condensing within the phone causes water damage just as badly as dropping it into any other form of water. It just smells a bit better…

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