Ive always gone with the highest storage-my 4S was 64 gigs, but i thought-be smart, save money, so i went with 32. Now i regret it tho, and i want to exchange for a 64. I went into the Apple store the other day and told the guy i wanted to exchange for a different size, and he said I'd have to 'call in the morning to see if we have stock'. I thought they kept a seperate stash of phones for returns and exchanges? Should i try a different store or will this be the policy everywhere?