Will verizon take jailbroken iphones with trade in program?

I have an iphone 4s in really good condition and online it says they will take $141 for my phone to go towards an upgrade but if they see it's jailbroken will they not take it or charge me for it?

Added (1). I don't want to loose my contacts

Added (2). Lose*

Probably not. Just plug it in and restore.