Since i preorder the iphone 6, which is a 16gb, i will be able to pick up today for sure but it havent been charged because it will only be charged when i pick it up. I changed my mind and i want a 64gb now, can i just wait in the walk in line to see if i can get the 64gb and if i do, can i cancel the pick up order after that? If not, i can still go back to the pick up line and get the 16gb. Can i do that?