Hey man,
I was in the same spot that you are in. I found specks of dust under my glass, and returned it for a new iphone. First I recommend making a genius bar appointment to do this since it has to be looked at by a "genius". Second I would check if the store you are going to has them in stock, I was lucky that they had a new one set aside for service issues. Third be ready to point out the issue. Good luck man.
JP
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