Depends if it is determined it was caused from manufacturing defect or damage - drop/abuse/water etc. If you are confident no damage was done, it would be a warranty issue. If there is damage, it becomes a insurance issue.
Oh goodness! This would have me concerned as well concettaweigan. We want to ensure we get you on the right route for replacement. Is there any damage with the phone? Please click here to see how to thoroughly inspect: http://vz.to/1FAmX2E. What were you doing on the phone when you noticed this happened?
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