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You should definitely be able to use both. I used trade in credit from my iPhone 5 to purchase the iPhone 6, and at that time they were having a deal where you got a $200 gift card with the purchase of any open box iPhone 6, and another deal where if you upgrade to an iPhone 6 you got a $50 gift card. Best buy let me use all of the gift cards and credits towards the purchase so I actually ended up making $40 in gift cards after everything. So they should let you stack them :)
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