I've searched quite a bit and I saw a few threads that said that the Verizon GS4 comes sim unlocked. But I put in a friends Sprint Sim and I got an error message that said "non verizon sim." I also saw tutorials on how to go into the phones menu by typing *#06# or *#0011# but these do not work on my phone. Is there a code that will work on my phone? Also, do I have to install a custom ROM on this phone to get the sim unlocked? I really don't want to go that route but if I have to I will.