I have an iPhone 6 space grey 32GB
How much would I get for a gift card to get a iPhone 6s Plus?
The following has a "See what yours is worth" link that will give an estimated value: iPhone Trade-up - Apple
You may also want to check with your cellular carrier as most also have similar programs. As with all such programs you may do better financially by selling it yourself.
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I have an iPhone 6 space grey 32GB