I got my iPhone 4 on launch date from an Apple store and noticed a couple of minor scratches on the bottom as soon as I took it out of the box along with the infamous antenna reception issue. Obviously I haven't taken it in yet to get replaced as I expect it to still be very busy, plus I don't know if they have enough stock to replace them. Can anyone who has had their iPhone 4 replaced because of reception issues, cosmetic imperfections, etc. describe the experience they had? Did they just activate a new micro sim card in a new iPhone and de-activate the used one or did they actually take a new iPhone 4 out of the box and switch the micro sim? Thinking about doing this tomorrow so wondering what all will happen.