IPhone back cracked without dropping it?

So my friends claims she was just using her phone when suddenly she heard a crack and there was a huge line through the back of glass of her iphone. I don't think she had it in the charger and she hasn't got a case on it. She has a white iPhone 4S relatively new but she's gets a new back to it tomorrow. I was just intererested. It may have overheated?

Probably not, I bet she dropped it and she's lying.

Look at all the people who have a case, even if it's one of those cheap thin slip over cases like I've had with no cracks in two years… And there she is with no case and a cracked phone saying it just happened. I wouldn't believe it, but I wouldn't tell her so. Just nod your head and say, "That's too bad."

If the battery had swelled the screen would of separated from the case. She's probably lying and doesn't want to get in trouble.

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