Either providing they have the stock.
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Yes you can use the phone and still return/exchange it within the 14 day period without any issues.
I bought an iPad mini 3 in 64GB used it for about a week and realised that I needed 128GB so I took it back and exchange it and just paid the difference.
I've also bought an iPod touch 6th gen and a pair of urbeats earphones. I used both and returned them for a refund within the 14 day period. It was very easy. Apple are great with their refund/exchange policy.
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Last year I got the 6S plus in silver but wanted gold. I wanted to swap it out for gold and called Apple to ask how I could do this. They said that I simply needed to make a reservation for the model I wanted and then take my silver phone into the store and that they would do a straight exchange. I made two reservations on two separate days for a gold 6S plus in the same capacity. On the first day I called the store to confirm that this was possible and they confirmed that all I had to do was bring in my phone and they would do a straight exchange. I didn't manage to get to the store to do the exchange because at the time I was suffering from morning sickness and fatigue so I ended up sticking with my silver.
I've also exchanged a 64GB iPad mini 3 for a 128GB mini 3 within my 14 days. They returned the iPad mini and created a gift card for the price of the 64GB model and all I had to do was pay the difference in price (£80). The whole thing took less than 5 minutes.
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I might do that myself (get 256GB) in the 14 days if I can get one in the same colour in a local store.
Carrier and what plan? If one of those plans like Jump, Next, iPhone Every Year...how did it affect that?
I ordered two Black 7+ 256gb but after thinking about it more I really don't need that much storage. My plan is to try and take them to AT&T store on Friday in hopes I can swap them out for the 128gb models.
I'm thinking quite the opposite, I preordered a 128GB Black 7 Plus for delivery on Friday however I wanted the 256GB. I am on the Next plan with AT&T, so does that mean an exchange would have to be done at an AT&T store so I won't mess up anything with my plan??
(I saw the incredible quality of pictures from Tim Cook at the Vikings/Titans game with an iPhone 7 Plus and if they look that good, I'm sure they are going to take up a lot of space)