Normally Verizons response when you trade in an iPhone is to give one of the three below reasons for chopping your pay to bits

1) the Charging Port is Damaged

2) The phone does not charge or will not hold a charge

3) the phone is water Damaged

You can see hundreds of complaints on here exactly the same, and thousands online.  I guess after reading so many horror stories on this, I would question why you would want to trade in your phone here instead of a third party (a reputable one) that will also pay more for the phone and not pull these little devalue the phone games