How do I flash my Verizon Iphone to work on Metro PCS?

I have my Iphone that I was using for Verizon but I want to switch to Metro PCS. I hear it’s possible to flash the phone do work on Metro. Anyone know how to do this?
Answer #1
what i know is, maybe ur iphone is lock to Verizon, if u want to unlock it, u need to pay money to do so… Thats why unlocked version of iphone is more expensive than the locked one cause it can use any sim card. Maybe this is for real deal?
http://myimeiunlock.com/
Note that i NEVER done it before so i dont know i just found its quite legit.
or u can use GEVEY SIM or R-SIM its cheaper