I have a iPhone 6 I'd like to exchange for a Plus. I see a Plus pop up for store pick up every now and then, but only for half an hour or so and I live quite a distance from an Apple store. I used my available "upgrade" pricing on my iPhone 6 already, so now I'd have to buy the Plus at full price if I were to order it through Apple's site for my line. Could I buy the Plus as a new line for my plan, then when I get to the store I cancel that order and exchange my current iPhone 6 for the Plus to get the upgrade pricing? Will I incur fees from Verizon for "starting" a new line or exchanging / returning phones?