Hi, how are you all? I purchased the iPhone 4S 32GB Black on Friday. Now I'm having regrets on both the colour and size. I was hoping for the white 16gb but that was sold out by the time it got to me. So, I was just wondering would it be possible for me to go into the Apple store where I purchased the phone and maybe exchange my black 32GB for a white 16GB and be refunded the £100? Many thanks!