
Samsung SCH-A670
a670 /a680
While it is possible you would need to get the phone unlocked from sprint and then verizon would need to re-program it (the hard part is the first step) I personally wouldnt recommend doing this switch.
Analog isnt as great as it seems, I have had only a few occasions in the past where all I could get was analog. and on these occasions not once could I get a call to go through. So I would rethink whether or not you truly need analog.