If I'm not mistaken if the phone was paid off properly and is free from a contract then you should be able to walk into VZW and have them carrier unlock it for you. If he didn't pay off the phone then it's technically a phone with a bad esn and the first part of this post needs to be fulfilled.
NO. No, not right, NO. Wrong. Incorrect. Invalid. Incorrect. Input rejected.
Do I make myself clear?
I'm getting tired of repeating this, but THE SCH-I545 IS NOT SIM LOCKED. It is not locked. It does not need to be unlocked. What you are saying is wrong, incorrect, invalid, unnecessary. You don't need to unlock. You get it always unlocked. You don't need to unlock it. Nobody needs to do anything to unlock it. It's not locked.
Do you get my drift yet?
The Federal Communications Commission required that carriers getting access to the 4G spectrum not lock their phones, so phones like the VZ Galaxy S4 are not SIM locked. Any carrier's SIM will work.
Comments like yours send people down a time-wasting path. It isn't locked. Why spend time unlocking it?