Okay I'm with Sprint and on my first iPhone, I pre-ordered 16GB one from local bestbuy on 7th. But I'm not sure if 64GB would be better value for money compared to 16GB or not ? What do you think ? I'm planning to give this to my wife and will be buying Iphone 5 for myself nextyear as it will be with 4G on Sprint. The store person at Bestbuy told me that I can exchange my iPhone for 1 time in first 14 days if I want to go with bigger size. Is there any charge for exchanging iPhone like this ?