I'd love to know, I will most likely give my X to my wife, get a new plan with the XS plus and trade in her iPhone 7. Last year Verizon offered me $350 for the 7, which I thought was very good, and I got $450 for my 7 plus. This year I'd be ecstatic with $200 trade in, at least it will cover my taxes and apple care. They are still $285 or so on swappa. Although I always wonder if it's not better to just throw the 7 in a drawer and keep as a backup phone or let my daughter use it.
Hopefully Verizon has a nice trade in sale, they seem to have them often, and hopefully it's not attached to having to open a new line of service.
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Maybe the day of release. Last year I overslept and didn't get the first round of X's on Apple's site. On a whim I drove down to Verizon on release morning and they had a few of them in stock and had a really nice trade in promotion of $450 for my 7 plus.