How to get a sprint iphone 4s to work on metropcs?

Just looking for an overview of the process… I'm a bit lost.

You can either get the phone unlocked and use it on MetroPCS or you can get the phone flashed to MetroPCS. If you've MetroPCS already, then you can get the phone flashed. If you don't have MetroPCS yet, get a MetroPCS SIM and get the phone factory unlocked and use it in the phone. If you need help with flashing or factory unlocking, mail me for references.