I can trade in, but all indications are I can get more on the open market, so I'm considering going that way. My iPhone 5 is de-activated with Verizon. What do I do about the Verizon sim card, leave it inside? Does the buyer HAVE to stick with Verizon? The contract is up, Oct 15. Paying to unlock the phone would probably negate any extra dollars I'd get for it, I presume? TIA.