I'm returning my black iphone 5 tomorrow to the apple store and was wondering how long it will take until i get back my eligibility to upgrade to a white iphone 5 at the discounted price. Will it instantly restore my eligibility or does this process take a while to go through? Has anyone done this before? I figured i'd return it tomorrow and just patiently keep checking the apple store, best buy, walmart, target, sams club, etc... until i found a white 32gb in stock. I talked to an apple rep on the phone this morning and she told me i have 30 days to return the phone and then to call AT&T and tell them restore eligibility but didn't know how long it takes. If anyone has past experience or advice please let me know, thanks.