Can I go to Verizon & trade my gold iPhone 6 for a space grey one?

I recently got the iPhone 6 gold, & the white front isn't really all that great to me, could I go to Verizon (my cell carrier) & give them this one (perfect condition) for a space grey iPhone 6?

I don't think that would work because if you traded it; they would have to sell that item used for less money.

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