The screen is 4.5 inches. It can be switched to another company but I believe that you have to have Metro PCS service for 90 days before they'll unlock it for free, if not you'll have to pay to have it unlocked.
I hAve the same phone it's Awesome I loves it!! I want to win one for my hubby cause he has a metro PCS too! Do u think if he puts his pcs card in the back of the phone would it work?