Iphone 4s from sprint carrier can i use it as a prepaid?

I bought a phone off craiglist. And its carrier is sprint. If the account is deactivated can i use it as a no contract phone? Obviously that phone is no longer in contract and its deactivated. Or how can i make it no longer a cdma and awitch it to gsm so i can use another carrier inside the us not for international purpuses

No, you can't use it unlocked unless you are doing it illegally. You also needed to check if it is cdma is clean.

Just gotta unlock the phone, need to have sprint do it, to unlock an iPhone ya gotta connect to iTunes and do a backup and restore, then get whatever sim ya want