Selling Phone Question

I currently have an outstanding balance with verizon, but they are not my carrier anymore, im in the process of paying the vultures back, can i sell my old verizon phones or will they not be activated because of the balance

They cannot be activated until the account is paid in full, sorry.

can it be unlocked and sold unlocked for another carrier

No, CDMA phones cannot be unlocked (well, it's technically possible but completely useless and pointless, nobody is going to activate a phone with a blacklisted ESN). More info: Unlocking a CDMA Phone...