Can I use a sprint iPhone on a CDMA service like metro, boost mobile ext?

Can I unlock this phone and use it on a prepaid service? Has anyone done this? IPhone 4.

Not anymore. It's illegal. It's possible though

No. Sprint won't unlock it and Boost won't accept it. Which is BS because it's same company!

Check out Ting, they're also a CDMA prepaid carrier that runs on Sprint. They may have a trick to do it.