So I want to bring my iPhone 4S, that is almost a month old, to the Genius Bar. Just earlier today, my sleep button got harder to press and now, it worsened. I have to put significantly more pressure for it to unlock and lock. I am obviously still within warranty, but I'm not sure if that sort of problem is covered under the one-year warranty. I was wondering if I take it to the Genius Bar, will they replace it for me right away? Will I need to bring my receipt? I don't have it with me, my dad has the receipt and he is away right now.