Hello, I ordered 6s on the pre-order night and like many of you it should be delivered by 25th. I also applied for Discover credit card for it's bonus of 20% basically and got approved. Now I am thinking I might return my iPhone and buy it again at apple store with 20% cash back basically. My question is: Do I have to ship my phone within that 30 days period or I can return it at my nearest apple store to get my money back. Then I will buy one again the next day with my discover card. Thanks for your help!!